I am 5'9" and between 145-155 pounds depending on the mileage that I am running. I am currently running in the Pegasus 31 and love them. The previous peg's were my go to shoe so I was concerned when they made such sweeping changes. My initial thought upon trying them on was they were lower to the ground and stiffer. I was worried this would lead to a harsher ride but was pleasantly surprised on my first 6-7 mile jaunt that they felt very nice, and faster under foot then any previous iteration of the Pegasus. The jury is out until i run a workout or long run in them but thus far I have been very impressed/