I rode a single speed for a while as my every day bike but I recently have gotten into fixed. Sheldon Brown was right, it is a whole different level of being connected with the road. To me it's the difference between driving an automatic and standard transmission car. But now I have two bikes. I ride the fixed for pure joy and an extra work out. But for commuting, errands, group rides with climbs I ride my geared Cross Check. I do like having some other gears when my panniers are full of groceries and riding into a stiff wind.