Been running a pair of the Dura Ace ones now for 4 years on various bikes. Cleats really don't show wear but the pontoons that straddle the cleat sure do. Good systems as long as you don't walk much. Gravel has a way of getting wedged around the cleat and you don't clip in.

Ritchey came out a couple of years ago with some knock off's that weren't real good. Buddy of mine just couldn't get them to work. He would finally get clipped in but had a hell of a time getting out. Lube and tension didn't help.