Are they bad for your tires? Well that depends on what you're using them for. If you're using them to correct out-of-whack camber on a lowered car, then yes, those are VERY GOOD for your tires. In fact, they'll save you tires from being ruined.
If you're talking about using them to put a mad-tite slant on your wheels though, then prepare to replace your tires every few months...