I've been riding on serfas tires for a year now. I had the fancy vittoria pro something or another, but when I went to Joshua Tree, I would flat every 5 miles. I found out from a LBS in Joshua Tree, that some local plant needles kept getting in the tires so he said riders around there use serfas because they're are more durable. I've had them for a year and had only a slow leak which I caught before a ride.

BTW why won't you answer you pm's.