Well, the rear Gatorskin got a flat after barely a week in service. That's irritating. Standing on a dark street corner working my mini-pump at 5 am and then it started to rain. I have to go down to the bike parking today to patch the tube. Maybe it is just bad luck and the tires will go a year without another flat. But I think I will put some sealant in the tubes after all. I ride to work every day and my tolerance for getting to work late with dirty hands is not high. I am okay with 2-3 flats a year, but get to 5-6 as I was doing before, and I'm unhappy.