I have a set of Fulcrum Racing 6 which is basically Specialized OEM from Fulcrum. Mix of 5 and 7 parts. They seem built well but are heavy (just under 2K grams). The free hub does sound like some pissed off hornets, not as loud as ZIPP or my ROL wheels. More annoying sound though.

either way...they seem ok but the noise and weight drove me to buy ROL Race SLs and I am FAR happier with them...