Do you mind, sharing your experience with it?
What do you want to know? I only use few features on it, so I probably can share only limited information. However, you will be always welcomed to ask question here.
I've not tried it yet, but I am VERY anxious to have ML get the firmware for the 5D3 out of *alpha*...so I can try it for RAW video.
If you check the ML forum, you will see the alpha version is very stable. I haven't had any problem with the alpha version.
I took a few days awhile back and read page after page after page.....
I'm still not sure the most up to date definitive method for even installing...and with reading on nightly builds doing this or that....well, I just don't right now have the time to spend with possible camera down time trying to keep up.
And..I've still not read where you can remove the boot flag after you install ML alpha for the 5D3...I think that is still a permanent mark on the camera at this point.
I have high hope for ML on the 5D3...but IMHO, its not ready for prime time yet.