I've got a track bike I built up with the S3X hub; I will not be using it for commuting. Or, rather, if I did, it would be a fair weather, light load kind of commute. I have bikes with Shimano 8sp Nexus and another with a 44/32 x 11-34 drivetrain and I tend to use most gears on both bikes over the course of my commute--no way I'd do fixed even with the 3sp hub other than maybe a couple times just to say I did it. Fun bike to tool around town on; not the most useful thing in the world.