I've been coming to this location for a few months now and have yet to have a bad experience. I think I was approached with the most add on's yet today, but each emoloyee accepted the first "no" respectfully (learn from this, Cobblestone!).
Today I took my car in after a weekend trip to the river, so it was a little dingier than usual. They did a thorough job cleaning out the interior and the outside was spotless, all for the basic wash price. Maybe they took extra care since they weren't very busy on a Monday afternoon. This place can be a zoo at the lunch hour or after work, so mid afternoon's during the midweek are highly recommended.
An extra bonus is I have been receiving $4 off coupons in the mail fairly regularly, so as long as they keep that off they have a loyal customer!