When I bought my Kona Zing Supreme it came with the Conti Grand Prix 4000 tires and I didn't think much of it. 4 seasons later and now I'm on my next bike I'm sold on the durability and performance of this tire.
I average 900-1000 miles on this tire (I'm 210 pounds) and rotate them in the middle of that to maximize life span. It grips well on corners and I rarely flat out - they are tough.
The colors are flashy and add a nice touch. Seriously I should stock up on this tire and you should too.