Pro- These are as light as advertised, about the same as Zipp 202s in crosswind (very good), holding up very well to rough roads, seems to give a slightly wider tire profile than 202s
Con- braking is marginal/fair despite trying several different pads. Have not ridden in rain.
Ungodly difficult to mount tires Pre-stretched Continental 4000s I put on by hand onto 202s and 6 flatted tubes and 3 broken levers still have not gotten onto these, although I originally only flatted 3 tubes putting on first tire. Specialized Cotton tires were impossible for me or my LBS to mount. First, the rims probably have a very very slightly larger diameter than the 202's. Second, whereas most rims have a large, deep bed between the walls of the rim, these have only a very narrow grove and then high "shoulders" underneath the rim walls. This means that the bead of only one side of the tire can fit in the grove, so the other bead is higher, taking away any slack to the tire bead on the opposing side of the wheel, causing the extreme mounting difficulty.
Overall an excellent special day wheel set if you can afford it but you must carry multiple break-proof tire levers when you ride or you will never change a flat.
I also incurred significant tire rubbing on left chainstay (actually wore a little bit of the carbon chainstay away) that did not occur with the 202's so these are clearly not as laterally stiff, although I did not notice it when I was riding.
Up-date - braking getting noticeably better and more consistent with use.