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I got ML on my 60D, and I have found that it comes with nothing but advantages. I haven't used it much other than the intervalometer which is great for time lapses, and focus peaking. The additional ISO settings are extremely helpful as well. The cons you're worried about are things like bricking/crashing the camera, right? I have had it for about a month and I've experienced no problems. I can't guarantee that it'll be 100% safe but it's fine for me. I don't even know why they call it a "hack". It's rather a firmware extension, IMO.
You could really just go onto their website to find out the features... But there aren't really any downsides. I've had it for almost two years and it's never done me any wrong.