Well, here's the update: I took the bike in, and Dave was totally friendly and helpful and didn't seem to mind that I monopolized his time for a good 40 minutes talking about bike parts. I guess we'll see the quality of their mechanical work when I pick the bike up. For what its worth, I watched one of the other wrenches putting a bike together while I was there and he seemed quite capable; at least as capable or (most likely) more so than myself.