The usual things will be there OP, possible battery drain, bugs, crashing. So if you're gonna run it make sure your stuff is all backed up so you have an option if your device is really messed up. I'm guessing the reports you've seen about it "bricking" your phone which is not really what it will do. However if you're running a beta which usually has a time bomb and you're not a dev. Then when the time expires if you haven't either wiped your device and loaded a stock iOS then the phone will be locked out. You can simply go to DFU mode ofcourse so it's not really bricked.