I work at Erik's so I won't comment on who I think does the best service but I do agree with what Wiswell said (by and large). As for lead-out time when I was last at work on saturday, yay two days off, our wait on a repair was only a couple of days assuming you don't need anything more than basic parts. The reason for this: towards the end of the season we don't order quite so much breadth of parts so we may not have that 11-23 10spd cassette that you're looking for, for example.

Why? To the best of my knowledge they're more of a boutique sales shop than a do-it-all service center. Though, if you've got a $5k road bike maybe that would be the place to go.