I've been there twice:
1) I had a fever and sore throat. The nurse (they didn't even let me see a doctor) told me there was nothing they could do.
2) I cut my foot. The physician's assistant (once again, I didn't see a doctor) put three strips of tape and a band-aid on it. Two weeks later, my cut wasn't healing properly, so I went to an actual doctor. He was surprised they didn't suture it, or perform some other procedure, given the severity of the cut.
The only pros are the parking, the friendly staff, and not having to wait long -- but of course that last part is probably because I never saw a doctor.
In the end, I won't go again.