the transition between geared and fixed is not that big for me. i do it multiple times a week. my road bike is purely for training and racing, though. if i am going somewhere to do something i always ride my fixed. i want to take the fixed on longer rides but i haven't figured out how to work fixed riding in. the transition period between bikes is not that bad, but i have been using my brake a lot more out of laziness. i just got clipless for my track bike which makes it a lot easier for me, personally, to control.