+1 on the shimano 520's. I got mine in 2006. I just got a new bike and moved the 520's to the new bike. I suppose I'll upgrade them if they ever wear out. Might be awhile. LOL

Also I use the multi-directional release cleats.

FYI: I thing the previous poster is referring to M324's. Those are clipless on one side, platform of the other. 520's are clipless on both side.