When I first had the tires mounted they were pretty new on the market. My local dealer's service manager gave me a super deal on them, if I would simply take a few photos and gave him my thoughts as the miles added up.
A real test came in a ride from from Las Vegas to Ft. Smith, Arkansas. Rain coming and (mostly) going. Wet traction is much better, steering feel and angular changes (leans) now have no "pucker factor" in the rain. Dry roads, I honestly can't find much of a difference, which is to say they feel good. I have noticed, however, as one previous poster wrote; the tire seems to be resisting squaring off, they maintain the nice rounded profile, and are only now beginning to show flattening along the centers. My pressure's are usually 40-42 or 38-40, for a solo rider.
Another curious thing, and I'll take my oath on it, they hardly ever lose air. I still check almost every pre-ride. Don't know why or what but they hold pressure like no other tire I've had. Maybe somebody else could comment on that also.