I converted a pair of 735s and a pair of 705s. Playing 2 nights a week, both sets of boots really started to break down after 4 months and both sets of outsoles collapsed down to the point of being unusable at the frame mounts after about 6 months. What Darkbyte said about the rigidity of the Graf outsoles is true. I've been on converted One70s playing 3 nights a week for about 9 months now and they are holding up fine. The outsoles are holding up well whereas both pairs of Grafs did not.