From what I've been reading on several forums including here, the general consensus is that KW V2's are pretty good with the exception of a few people having clunking noises. I found a local set with 20K miles on it and haven't decided on buying it or not. He has an '08 E92 and I have a '10 E90. Part numbers are the same according to KW's online store so should fit. Should I just buy a new set instead? I know they have a limited lifetime warranty on manufacturer defects. Anything in particular I need to look for besides the usual rust?