The one thing I have not tried is the e stab, but straight out of the box with zero set up other than a quick balance, on the RS4 mini with the optional tracking module, it worked superbly.
Not even close to anything like overheating, but then so far, I have only really been shooting stills with it.
Start up time must be fine as I have not noticed anything other than it takes a second or so for the zoom to find it’s last setting, either; 28, 50 or 75mm as I have it set.
Battery life excellent. I just came back from a week long trip to Scotland and shot well over 1000 frames and battery still showing 2 bars.