Great ride feel, great handling tire. Most comfortable tire I've ever ridden (vs. Vredestein, Conti 4000, 5000 and Gatorskins). On sale, they're a great deal. At full retail (> $60, not so much).
I switched from Conti GP 5000's to these (and then to the 4S for the California "winter"). I really like the way they ride, but I am often disappointed at the durability of this tire. Granted, at 200lbs, I put a lot of weight on this tire and a decent amount of power down. But, they seem to get nicked and cut far more often than Conti 5000s.
If you're looking for great feel, these tires are the best. If you're looking for something that will last a long time on less than perfect (no debris, smooth surface) roads, these are not the tires for you.
I made the move to the Pirelli PZero from Conti 5000's. The Conti's were a really bad match for the Roval wheelset that came with my new Aethos (love that bike by the way). Changing a flat with the Conti's was a 12 - 14 minute process because it was so difficult to get the bead of the tire over the rim to pull out the flat tube. It is still tricky with the Pirelli's, but overall a much easier fit and fixing a flat is back to a 6 - 8 minutes process. In terms of ride, the Pirelli's are really comfortable and with about 400 miles on them so far they seem to have about the same puncture protection as the Conti's (just one flat but it was a large piece of glass).
Easy mounting tire and good road feel. I've been using them on D/Ace wheels at ~90psi and have good grip in the wet (NorCal winter) & dry. Comfortable riding, maybe not as supple as the Pirelli Velo 4S, but close enough and more than fine for training tires. Picked up a few small rock/glass cuts (normal) but no flats, so nothing to note there as of yet. Wear seems reasonable. Good value for the $, IMO. Happy riding!