I'm currently running the daVinci 40h V-22s that came on our tandem. These wheels have been absolutely bulletproof; doing a minor adjustment to the WI hubs now. I have decided to get another set of wheels, probably an everyday, somewhat lighter set.
We're not racers, we're senior citizens. Our specialty is downhill. We're a 340-350 lb. team and the bike, itself, with rack, trunk, etc. is not super light. I'm talking to my LBS and am considering Spinergy and possibly 36h HED Al rims with WI hubs. There are a number of posts and threads relating to the CF HED wheels, but I don't see much tandem-wise WRT to the conventional HED rims. Information and Opinions welcome as usual.