I have Gatorskins on my old Trek 1.1 that I use for backup to my Domane with Grand Prix 5Ks. I like the Gatorskins better than the original Bontrager tires. I've never had any trouble out of the Gatorskins. Good durable tires, IMO.... plus it's nice not to have to worry about flats. They aren't as fast as the Grand Prix, but I didn't expect them to be.