What are the main pros and cons? In terms of speed, maintenance, comfortability and overall performance? How often will I have to bring a fixie to the shop opposed to a standard entry level Trek road bike?

My current bike feels sloppy - 9 speed with derailer that I barely ever touch, vbrakes with annoying wires, occasional gear jumping... just some of the main reasons for conversion. It's been three months and it has already visited the shop a few times