My karma seems to be pretty sturdy, I haven't had any of the issues you see others posting about. But then I don't try to use mine for a hockey puck, either.

I'm quite happy with mine... the only issue I have is the screen issue (it scratches VERY easily). I need to take the time to make myself some screen protectors, though, and since I haven't done that yet I really can't complain too much.

-- Gary F.