Vittoria Randonneur Hypers (which I believe have been renamed) are fantastic tires. They are much lighter than the others tires mentioned, with low rolling resistance. Try a lighter, faster rolling tire for a change. My prediction is that you won't go back. Flat protection isn't everything, unless you ride on crappy roads with lots of glass and other debris. Don't get me wrong, the Vittorias are flat resistant and long lasting, just not bombproof. They are very nice riding tires, and have reflective sidewalls -- a real plus for commuting. I've got 32 mm Hypers on my touring bike and it rides like a dream.