Great so far.
I've used Michelin Pro Race and Conti GP4000s. I liked the feel of the Conti's the best, but these are my second favorite for feel and probably favorite overall of the three. I've only had them 400 miles, but they're great so far. No flats yet and seem to be wearing very well. They feel is not quite a supple or grippy as Conti, but I like the feel of these better than the Michelin's.