I've got a pair of CR420s for racing only (deeper aluminium rims).
I have only really used them in crits and TTs but they are quite light and I would use them on any terrain. They have the advantage of being a bit aero too.
As far as durability goes, they don't handle Sydney roads too well. I have riddein them only about 10 times in races since buying them and the front has gone out of true for the second time.
My ideal prefference would be Zipp 404s