I have mixed feelings about the T-Servs. I had my second flat yesterday that made me late to work on a set of 26" by 1.25" I put on at the beggining of the season. Probably have 1000-1200 miles on them now, although the first flat was within the first 100-200 miles in May. I have had a flat on the back and now the front. Both times it was a small piece of glass that worked its way through the Kevlar. I do like the way they roll and they are not hard to get off and on the rim if you need to do a roadside repair. I don't know if having a flat every 500-700 miles or 6 months is anything to complain about. Although the folks who run Armadillos or Marathon plus seem to go thousands of miles between flats. I am thinking about switching but I am also concerned that the Armadillos or Marathons will be difficult to fix if you do get a flat.