We just got them here in Japan, and I used them in the first race of the season. Initial impressions: excellent grip, the rubber feels sticky compared to the Pro2s. However, I'm expecting that they will wear out much sooner - if only used as race tires, not a big deal imo. They are hard to get on a rim, esp if you use Campy wheels - I pinched one tube getting them on, which I very, very rarely do (like once every few years). They are definately narrower than the Pro2s, both measurable, and visibly (altho this could be optical illusion, as they only have the one grey tread in the center of the tire). They roll well - according to btr (
www.biketechreview.com ) rr tests. As well, they are as light or lighter than both the Pro2s AND, interestingly, the Pro2 Lights ( look at
http://weightweenies.starbike.com/listings/components.php?type=roadtyres ).
All in all, I would say this is an excellent race tire. Highly recommended.