Yep...we run it on our 5D3. It's gotten to be more straight forward about how to load it, but I wouldn't try it on rental gear.
The dynamic range and clarity is absolutely incredible...but so are the overall file sizes. It adds quite a bit of time in post to move the data, transcode it, etc. So it's not for every job, but there are times when it is useful.
[Warren Eig]" my 5D Miii is at firmware 1.2.3. I'm waiting and hoping ML releases a Raw solution with this version of the Canon's firmware."
We had 1.2.1 on our camera to test the "clean" HDMI out. It was alright, but at only 8-bit it didn't give us huge leg up. Once the hack was usable we just rolled our firmware back to 1.1.3 to work with ML RAW. Not too big a deal.