I just recently switched myself. I was having right knee soreness the last couple of years from fixed (skipping and backpedaling). So I set it up SS and I like it a lot. I still love the feel of fixed, but there is a certain freedom with just SS. And as the poster above says, I feel like I ride faster because of the ability to brake hard, and to coast over bad road sections, and to fly downhills... it all adds up on a one hour commute.