I've got some 700x28 gatorskins and think they're pretty great. I did just get a flat a couple of weeks ago from a shard of glass but it has been a while since I've gotten a puncture flat on these tires. Most of the kevlar lined tires you'll want to inspect to make sure if there is any glass/thorns/wire in the tire that you pull it out before it works its way through to the inside of the casing and punctures the tube.