Now have @ 800 miles on my first set. No flats or cuts so far. Ride quality is good I can't tell the difference between these and the 4000s they feel the same. Hard to tell what the longevity will be- typical for me the rear is worn a little and the front looks almost new. Re. the problems people are having mounting them they went on my Boyd 44s very easy just keep the beads in the center groove as much as possible & put a little air in the tube to give it some shape.
West