I've had my fair share of visits to RBM only to be ignored by the sales staff, (that's both in Richardson & Dallas). I'm a commuter, riding a 25-yr-old, steel bike so I'm not going to generate much commission.
That being said, if you need wrench service, I cannot say enough about the guys at the Dallas store. They've always been super helpful, even when I'm fixing the bike myself. I've walked in there just before they close on Sunday and had them float a free tire so I could get to work the next day.