Wow, I just had an innocent enough question followed by some website research ... but had no idea some folks out there would be so spiteful in return for no apparent reason. Sheeesh.
Who's spiteful? I read a bunch of people chiming in saying "I haven't seen a problem" and "Works great for me" and "Stability is just fine" as well as a fairly reasonable set of positives about it.
Spiteful would be more saying you're a troll looking to bash something you haven't tried out or researched well, and just want the attention and we need the smite back simply for users like you.
But I'm not saying that, nor really meaning it. Just simply noticing you've had 3 posts, all in this thread, and all in the negative about a single 3rd party firmware that, while it has had problems in the past and undoubtedly in the future, generally doesn't brick or permanently damage the cameras users try and use it on. Oh, and Canon's firmware isn't perfect either. Virtually every update includes fixes to bugs that affects a small number of users that can be a real problem.
Personally, I haven't read anything anywhere that there is a strong
possibility it will damage a camera with the exception of possibly some early, early builds for newly supported cameras. But they do warn you multiple times about those releases. For the rest, they simply say something to the affect of "By the way, this isn't officially Canon sanctioned, and while we haven't had any trouble, nor hundreds of other users for this release, it's at your own risk."