I got some mavic carbone SL from them for $500 about two yrs ago. Beat the hell out of them used wheels. Good people and fast shipping. Good detailed enough photos so you have an idea of the condition of the set.
Zipps are tricky, look at the hubs color ways, make sure you get 11speed stuff, most there problem/recalls were around the 10spd silver hubs if I remember correctly.
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Rule #10 // It never gets easier, you just go faster.