As mentioned above, the lack of tubeless tire choices has steered me away. The system weight really isn't any lighter given the heavier weight of tubeless tires, plus they are a pain to get on and off the rim. I know several people that had them and switched back to tubes for those reasons.
BTW, I ride my DA 7850 24CL wheels at 105#, 23c, 90-95# for 25c, of pressure and never had a problem with pinch flats. Most people ride their clinchers at too high a pressure. 116-120# is max inflation but not always the best inflation.