@Spring Pictures
What's the longest recording time on 5d2?
That is totally dependent on your settings and card size, but maxed out(75 MB/s) continuous recording on a 64GB card would be around 15 minutes I believe. If the max data rate is 73-75 MB/s so you can do the math, also lower resolutions have lower data rates and longer record times.
What's the largest reliable resolution (is it 1880x1080)?
Yes I believe some with KomputerBay cards have had near continuous at this resolution, for me my highest continuous resolution on my 1000x promaster card is 1880x940.
How did you all overcome the 4GB FAT file size limit?
ML automatically splits to a new file once the limit is reached with no frame loss, the files are then recombined on a computer so the 4GB limit is no longer a factor.
I plan to use raw video in the field, how dangerous are these nightly builds in your opinion?
It is Alpha software and there is always a chance for bugs, however it has been very reliable for me I have not had any issues since May its has been pretty rock solid for me. But as an example, one of the latest builds caused massive speed loss on some cameras until the memory card was formatted and ML re-installed. No big deal but could be a big problem if it was discovered out in the field. I would recommend testing any new build before use.
And realistically is my camera in danger, or really just my cards?
Yes your camera could be damaged, although I have no fear or reservations about using ML and if it were to destroy my camera I couldn't afford to get a new one. At the heart of ML is a firmware update that enables the camera to boot software from the card. Any time you update the firmware on any device you risk bricking it, ML is no exception. There are other risks as well such as software causing the camera to lockup and overheat or some new feature pushing the sensor to hard and frying it. That said I use it and I have installed and used it on my company camera as well. Also the Dev's here are awesome and they really want to give us something that is safe and reliable, they are very carefully and strict about restricting new developments that could damage a camera and stuff generally doesn't get into a nightly build until it is fairly refined.
All I can say is. I have ML installed and I use raw video in the field, what you decided will be up to you.