I've been taking clothes here for alterations for years and never had a problem. Mostly I take pants to be hemmed and the prices are reasonable. For these simpler things, I'd recommend Lynn's. There's usually a good two week turn around, but if I can remember to plan ahead, it's no big deal. And a few times when I've asked about picking up earlier, they've always accommodated.
*NOTE: cash/check only, no credit cards - half deposit required at drop off