I had the checkpoint ones and just recently switched to the SKF wheel seal kit. checkpoint lasted longer than oem with regards to grooving, the SKF i have not had for long, but the fact that the seal turns with rather than against the spacer means the spacer will last longer - still to see if the seal lasts
http://www.skf.com/us/knowledge-cent...#tcm:12-125118
http://motocrossactionmag.com/news/m...heel-seal-kits