Avoid this place at all cost! I have great insurance, but just moved to the area and haven't found a primary doctor yet. However, I was in pain (not the kind that called for an emergency room, but still very uncomfortable) and this place was only 5 minutes away, so I gave them a try.
Won't do that again. I sat in the waiting room for 90 minutes while everyone who came in before and after me was taken care of long before I got in to see a doctor. Many, but not all, were obviously in there for drug tests. I'm fairly certain there was only one doctor on staff who wasn't handling those tests.
The doctor was clearly working in a place like this because any decent place wouldn't have him on staff. He spent all of 30 seconds with me before dismissing my issue as something that would go away in a few days. It didn't, by the way - fortunately I received care elsewhere after this and they immediately recognized and fixed the issue.
So, if your employer sends you here for a drug test - fear not, the place seemed to be clean and you will survive it. But if you need any sort of medical attention for any other reason, do NOT go to Concentra.