I agree with Nanci and Grog. Last year I took the Marin to LBS for a pre-triathlon tuneup. Picked it up, didn't ride it the day before the race. The 28 miles of bike part of the race were not great. A skipping feeling with the gears, shifting problems, the whole thing felt loose and wrong. I took it back in--they'd forgotten to do some vital piece (I can't remember what). From now on, I ride my bike around several blocks and shift a lot after a tune-up before I pay them. You definitely should feel better than that on a tuned-up bike.