bushings? I installed the whiteline eccentric camber adjustment kit. I also noticed some play due to wear after perhaps 3k miles or so. I pointed the finger at myself, assuming that I wasn't diligent enough in relubricating them via the zerk fittings.
If yours showed wear after just 500 miles, I'm inclined to agree with you that their bushing kits are just shoddy designs. Time for Nismo bushings and 300degree spacers for me!