thats funny, civicsiracer ^^^ doesn't seem to have any problems with them.
I know the ball joints are supposed to have a short life-span, but honestly, changing out the balljoints would be less of a hassle to me than adjusting a regular(rotating a-arm mount bushing thingy) camber kit. On top of which, the S2 kit is compatible with Orijin Motorsports (HAN sponsor) solid a-arm bushings, which I plan on running. I've never heard of the arm breaking or bending, just the ball-joints going bad.