We took our car to Stevens to be detailed to get ready to sell it. They just all around didn't do a good job. They didn't vacuum all areas, half the vents were cleaned and half were filthy, the roof was completely untouched, door pillars, handles, etc. They didn't "detail" the car, they just gave it a little bath. We had to finish all the things they didn't bother with ourselves.
I wouldn't recommend them based on our experience, not for detailing anyway. We've never used them for any of their other services so I can't comment on that.