I wanna try using ML on my EOS M but I'm hesitant to use an alpha build. Can ML be removed easily?
It lives on your memory card so yes it can be formatted and erased very easily. Read the ML website instructions and guidelines about installing and removing it first though. Don't take my word for it. (I don't want to be held responsible!)
There is risk involved as with most things electronic; things can go wrong. However, if I was to choose a camera to test the water with ML for the first time, the EOS M would be a good candidate because it's relatively cheap. The alpha build seems quite stable, I'm not seeing any major bugs. Sometimes the preview screen doesn't want to zoom when pinched (This could be due to me using a manual only lens).
The question you need to ask yourself is "do you NEED magic lantern?"
The first time I tried to install it I cocked it up and I thought I broke it! I didn't panic much but there were a few minutes of self loathing!
Removing the battery as soon as possible is recommended if things go wrong!
Note - after I watched the Youtube video I posted and followed those instructions, it worked.