I have the DJI Ronin and can tell you the build quality on it is top notch. I met another shooter who had the Came (forgot which model) and he said he ended up returning it because it didn't work for him. I let him try my Ronin and he said the overall quality versus the Came is night and day. I don't have experience with Came gimbals at all so I can't really comment on it. Also one thing you need to consider is that Came is overseas, so if you have issues and need to return, it's going to be a headache.
As for the Ronin, the rig is VERY HEAVY. Unless you have the arm strength of a NFL player, I don't see anyone lasting a day or even half with this rig alone. I have both the Blackmagic Production 4K and Pocket cameras... and even on a stripped down load (Pocket + DP4), I don't see myself lasting half a day with it. I just ordered Atlas 2 rod camera support the other day so going to see how that goes. With the Atlas, I should be able to last all day with the Ronin.
Having said all this, the Ronin is simply amazing. When I first received it, it took me 10minutes to have it up and running. Now it only takes me less than a few minutes.
Side note.... I was at Photo Plus Expo last week and had a chance to toy with Freefly Movi and Defy gimbals and both are lighter than the Ronin, but the prices are also higher.
