I just got a S975 Cinqo, only took Quarq 2 weeks to get my PM to my door, and gave my PT wheels to the wife or times when I want to ride the Synapse with the BB adapter thingie. No regrets except now I have a Red crankset sitting in a box and some nice DT Swiss/Aerolite 30mm wheels sitting on my wife's bike.
Best part of it all, imo, is the upcoming iPhone app to recalibrate the Quarq when I switch to chainrings, 50/34 <-> 52/36 when I want to do TT rides. Gotta get a TT frame now, probably a Slice. Yeah, fat chance here in So. Cal where Tri's are all the rage. GL