I didn't use this company, but did another Groupon detailing a few years ago.
It took forever to get an appointment, because they'll only do one or two groupons in a day. I think it took us months, and others had a similar experience. I remember Quitta complaining about how long it took.
The place that I bought from did a half ass job. I was really disappointed in the work. I remember wax was not properly removed and the interior dash had streaks. I also found spots where there was still a layer of grime, so he wasn't even washed properly.
The place I went to was in Sterling, so it wasn't the place that you're looking at. I will never do another detailing Groupon again after the experience I had. I just don't trust that they'll do a good job when they offer a really good deal.
Ali