I switched to clipless on my fixed gear a couple months ago. Clipping in and out is not that bad, it took like an hour or so of just clipping in and out on my trainer to get the muscle memory down and that's about it. I like everything about them except the shoes. I have some used Icon SPD's and an old pair of Mavic cyclocross shoes that i got from a friend, they aren't as bad as road shoes but they are still pretty goofy looking and hard to walk around in. If I'm going on a quick ride I usually just ride on of my bikes without clipless pedals, but I'm looking at getting some shoes like the Rondels and getting clipless for my Motobecane.