cody humphreywrote a review of Continental Grand Prix 4000 Tire on February 23, 2009
I've got over 2K miles on these tires now. No issues whatsoever. I just bought an extra set for backups. They roll well, grip the corners, I don't notice them at all. They are a bit pricey, but if you can find them on sale, they are worth it. I'm 270 and ride the 25mm tires, and they give me a relatively comfortable ride at 115 psi.