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Or this
 

I have managed to get almost 30 seconds on my 64gb Komputerbay x1000

5d3 raw with the fast CF card (i use sandisk extreme pro 160MB/s) can shoot continously 50 fps with 2.35:1 aspect ratio. 50 fps with 16:9 gives about 10 seconds, 48fps - 14 sec, 60 fps just 5 second bursts with 16:9 and 13 sec with 2,35:1. Recently i tested 2:1 aspect (looks cool) and 50fps - 18 sec, 48fps - 32 sec, very usable IMO. Everything with sound and global draw ON (all on screen stuff ON), with sound off and GD OFF recording times can be a little bit longer.
I shot this sime time ago, 50fps 5d3 raw, testing new 70-200 f2.8 lens so often lack of focus unfortunatelly.
https://www.youtube.com/watch?v=SEabzplnmhY

This is great comparison. I am using glidecam almost every day (couple years now) - the best tool in my toolbag I can imitate tripod, dolly, slider, jib, if i had to take just one thing with me beside the camera i would take the glidecam. No firmwares, no batteries, easy to handle, can take it as carry on baggage, can take it to the mountains for a hike, can use it in the rain (DGS version with improved gimbal), most people doesnt pay attention to it, it is quite stealthy, can go through the crowd with it. It requires a lot of training but it pays of.
 

Cheap chineese flycams and similar stuff are nowhere near glidecam quality (and usability) unfortunatelly. I tried some small flycam and it was impossible to balance it properly, there was many small issues with handle, gimbal, loose screws etc. With such a simple construction those little things and quality overall are super important, i think there is no point in buying cheap versions because they just dont work properly. I had glidecam HD2000, HD4000 and now i have DGS, they all were great, they were precise and consistent in balancing, i could calibrate gimbal when needed etc.

This is great comparison. I am using glidecam almost every day (couple years now) - the best tool in my toolbag I can imitate tripod, dolly, slider, jib, if i had to take just one thing with me beside the camera i would take the glidecam. No firmwares, no batteries, easy to handle, can take it as carry on baggage, can take it to the mountains for a hike, can use it in the rain (DGS version with improved gimbal), most people doesnt pay attention to it, it is quite stealthy, can go through the crowd with it. It requires a lot of training but it pays of.
 

This is great comparison. I am using glidecam almost every day (couple years now) - the best tool in my toolbag I can imitate tripod, dolly, slider, jib, if i had to take just one thing with me beside the camera i would take the glidecam. No firmwares, no batteries, easy to handle, can take it as carry on baggage, can take it to the mountains for a hike, can use it in the rain (DGS version with improved gimbal), most people doesnt pay attention to it, it is quite stealthy, can go through the crowd with it. It requires a lot of training but it pays of.
 

This is great comparison. I am using glidecam almost every day (couple years now) - the best tool in my toolbag I can imitate tripod, dolly, slider, jib, if i had to take just one thing with me beside the camera i would take the glidecam. No firmwares, no batteries, easy to handle, can take it as carry on baggage, can take it to the mountains for a hike, can use it in the rain (DGS version with improved gimbal), most people doesnt pay attention to it, it is quite stealthy, can go through the crowd with it. It requires a lot of training but it pays of.
 

Yesterday i took my 5d3 to the airfield to test the recently added new S16 crop feature. Correct framing and fluid live view (two the most important improvements) are just essential to shoot fast moving objects. What a great new tool!!!
Almost everything was shot with 70-200 f2.8 IS II with 3x 1:1 crop at 1080p 25fps. Lens set at f8. No single damaged frame (recorded on sandisk 128gb 160mb/s card), just perfect. I have to get canon 2x extender now to have 1200mm lens
 

Yesterday i took my 5d3 to the airfield to test the recently added new S16 crop feature. Correct framing and fluid live view (two the most important improvements) are just essential to shoot fast moving objects. What a great new tool!!!
Almost everything was shot with 70-200 f2.8 IS II with 3x 1:1 crop at 1080p 25fps. Lens set at f8. No single damaged frame (recorded on sandisk 128gb 160mb/s card), just perfect. I have to get canon 2x extender now to have 1200mm lens
 

Yesterday i took my 5d3 to the airfield to test the recently added new S16 crop feature. Correct framing and fluid live view (two the most important improvements) are just essential to shoot fast moving objects. What a great new tool!!!
Almost everything was shot with 70-200 f2.8 IS II with 3x 1:1 crop at 1080p 25fps. Lens set at f8. No single damaged frame (recorded on sandisk 128gb 160mb/s card), just perfect. I have to get canon 2x extender now to have 1200mm lens
 

Yesterday i took my 5d3 to the airfield to test the recently added new S16 crop feature. Correct framing and fluid live view (two the most important improvements) are just essential to shoot fast moving objects. What a great new tool!!!
Almost everything was shot with 70-200 f2.8 IS II with 3x 1:1 crop at 1080p 25fps. Lens set at f8. No single damaged frame (recorded on sandisk 128gb 160mb/s card), just perfect. I have to get canon 2x extender now to have 1200mm lens
 

Never lost a frame.

5D3 in raw mode 24/25fps 1080p 16:9 records 83-84 MB/s. Which gives 5GB per minute. 64GB is  12 minutes, 128GB is 24 minutes, 256GB is 48 minutes. Simple as that. Maybe you card was faulty.
About alexa - i have been on set of cat food TV commercial, shot on alexa xt - everything in arriraw. Nobody even mentioned prores. I was making BTS video - everything in raw either 2 day on set with 5d3 - no problem at all (but for that i bought those sandisk cards and didnt even try to use KB 64GB 1000x shitty card. 
Yesterday ML developers unlocked fully functional 1920x1080 3x crop - now it has fully working real time framing, up to this point it had black/white choppy look on the screen, now it can be treated like normal, usable s16 crop. They have also unlocked 50/60 fps mode without the need of streaching, maxumum resolution is 1920x648 (so very wide) but no image artifacts, IQ the same as 1920x1080 with black bars.

5D3 in raw mode 24/25fps 1080p 16:9 records 83-84 MB/s. Which gives 5GB per minute. 64GB is  12 minutes, 128GB is 24 minutes, 256GB is 48 minutes. Simple as that. Maybe you card was faulty.
About alexa - i have been on set of cat food TV commercial, shot on alexa xt - everything in arriraw. Nobody even mentioned prores. I was making BTS video - everything in raw either 2 day on set with 5d3 - no problem at all (but for that i bought those sandisk cards and didnt even try to use KB 64GB 1000x shitty card. 
Yesterday ML developers unlocked fully functional 1920x1080 3x crop - now it has fully working real time framing, up to this point it had black/white choppy look on the screen, now it can be treated like normal, usable s16 crop. They have also unlocked 50/60 fps mode without the need of streaching, maxumum resolution is 1920x648 (so very wide) but no image artifacts, IQ the same as 1920x1080 with black bars.

First of all, KB 64 1000x is too slow and too unreliable card for ml raw. I have one and had many stopped recordings either. Now i use sandisks 128gb 160mb/s and have no problem at all. No recording stops with 24/25 fps ever. I used the camera during the summer in italy with air temperature about 40 degrees centigrade with no overheating issues, internal temperature was about 60 (on ML termometer) and no recording stops. I shot many short, 1-3 minutes clips though so in fact the camera had some time to cool down. The card was very hot indeed but everything worked as intended.

Today i made some tests with dual ISO mode which lets to record with two ISOs, there is possible to gain additional 3-4 stops of dynamic range for the price of aliasing in highlights and shadows (where resolution drops by half) but midtones retains full resolution. 
So, about the test - I exposted ETTR on the sky to avoid clipping, processed the files with cr2hdr and than did some grading in resolve 12. I lowered the highlights -100, shadows +100 and than raised the overall exposure + 3EV. I had to make some tweaking in nodes to avoid clipping in the bright sky after that.There was some noise in the shadows but i get rid of it with the neat video resolve plugin. I get a quite flat image so added some contrast and little bit of arri lut to the taste. And a film grain on top of that.
The sky was quite bright despite the clouds, with ETTR the car interior was very underexposed, without dual iso recovering of such amount of shadow information would be impossible.
I didnt use dualiso feature so often before but now i am more and more confident using it in some situations. In this test i used 100/800 isos, there is aliasing and moire especially visible in power lines and car interior elements but it is not very distracting and i am very satisfied with quality and especially dynamic range.
 

Today i made some tests with dual ISO mode which lets to record with two ISOs, there is possible to gain additional 3-4 stops of dynamic range for the price of aliasing in highlights and shadows (where resolution drops by half) but midtones retains full resolution. 
So, about the test - I exposted ETTR on the sky to avoid clipping, processed the files with cr2hdr and than did some grading in resolve 12. I lowered the highlights -100, shadows +100 and than raised the overall exposure + 3EV. I had to make some tweaking in nodes to avoid clipping in the bright sky after that.There was some noise in the shadows but i get rid of it with the neat video resolve plugin. I get a quite flat image so added some contrast and little bit of arri lut to the taste. And a film grain on top of that.
The sky was quite bright despite the clouds, with ETTR the car interior was very underexposed, without dual iso recovering of such amount of shadow information would be impossible.
I didnt use dualiso feature so often before but now i am more and more confident using it in some situations. In this test i used 100/800 isos, there is aliasing and moire especially visible in power lines and car interior elements but it is not very distracting and i am very satisfied with quality and especially dynamic range.
 

this fairly recent topic talked alot about the 5d mark ii raw video, a good read i think.

HI, just shot this, 5d3 ML raw 1080p 25fps, FF and 3x crop mode, all handheld with 70-200 f2.8 IS II (sometimes i used fence as a support). Very little CC in resolve, all clips set for BMC profile and added one simple BMC lut. I am soooo pleased with the color out of this camera, just love it. And i am shocked how easy it is to shoot now - this clip i edited entirely straight from two 128GB CF sandisk cards with two usb 3.0 card readers, used MLVFS so didnt have to copy anything to HDD. Just inserted full cards, "mounted" via MLVFS and almost instantly opened in  resolve 12. Fast CC, exported as 10bit DNxHD444 1080p, cut in premiere and exported as 4k h264 - 4k just for youtube better 1080p quality.
Do you guys think that upgrade to 1dx mark ii would be really an upgrade to 5d3 with ml? Right now autofocus is the only reason for me to think about 1dxII, I am worrying about loosing 1080p 14bit raw for 1,4x crop 4k (beautiful in fact) but without raw flexibility.
 

What about 25fps?

I got this info from a guy who just tested the 4K video capabilities of the camera:
"It records all formats to CF card also. I tested it today.
The 60fps @ 4K would bog down my card after about 10 seconds. But I think if my CF was just a little bit faster is would be able to hang. the 24fps and 30fps @ 4k will shoot forever. It’s awesome."
So the expensive Cfast cards are only needed for 4K 60p.

Right, ML screen sharpening does wonders, much better than their own peaking and the one i have seen in a7sII (a7sII in real life has lower screen quality than 5d3, checked them side by side. Additionally peaking dots was making a lot of mess).

So, is that mean 120fps full frame 1080p? That would be really great. No crop like a7sII od c300 II in 120fps? I wonder if they improved 1080p codec quality. Something like in 5ds would be nice.

Glidecam HD4000 No batteries, no firmwares, no problems during travelling.