I wanted the black Cs (just for looks), but have the silver SLs - I've put a couple thousand K on them, but all on a geared roadie - so skids/stopping I've no experience with them... I'll always recommend them, though - beautiful pedals and I love them dearly - I've never had a problem when clipped in, they've never popped out on me unexpectedly (this has happened with my SPD pedals) and are super-easy/quick to get into without needing eyes down, etc. Stomp/clip/giv'er.

I got mine for about $60 through a store on eBay, bargain compared to the local stores here.