Went on a Groupon today for the first time. I was "greeted" by two guys who told me that my windshield was in such horrible condition that it might break going through the carwash and I had to replace it, my insurance would pay for it. My windshield is in great shape...just trying to commit insurance fraud. It was a hard, hard sell. When I said no for about the 6th time, they said, "Fine guess you'd rather replace it than get it fixed for free." It took 5 seconds to get a windshield salesman but 5 minutes for somebody to finally come up to help me get my car washed and oil changed. Talk about a bad first impression!
Next, I had to wait for over an hour to get a simple oil change and car wash. The waiting room was sparse but did have a nice aquarium.
Finally, even though I had a $22 groupon that should have covered the cost, they charged me $5 extra for random things like $1 fee for SUV (it is a Hyundai Tucson), other service fees and taxes.
I didn't have as bad of an experience as Luis T, but mine was bad enough that I will never be back.