I have had another hour on the saddle, as the previous poster mentioned I have the "Sport/Racing" model. I did not measure but just based on my size I got the medium size. I am getting used to it, as BengeBoy mentioned, there is definitely a small "sweet spot". The main problem I had this time out was an irritating "creaking" sound, but I may have not had my seatpost / saddle attachment tightened enough. The front end though is still comfortable. I keep my saddle flat with almost no tilt. So the jury is still out for me.