I rode one for my commute which was 13 miles each way for awhile. I never could have ridden it without a break because it was to scary. I did like the simplicity of it and sometimes I think oh I could try again. I have permanent shoulder damage from a wreck that would never have happened on my singlespeed or my geared bikes. It was a freak deal where I hit a a pothole and for one split second stoppped pedaling and was thrown off my bike which resulted in PT/ surgery of sorts and some pain I will always have when I ride. I should have had a complete recovery however through a comedy of errors it was not to be. I think you could use rollers because they offer the smooth pedaling and also sometimes they can be a bit scary. For simplicity I love my singlespeed because it is light and fast. I know many people who have never had any problems riding fixed.