I visited Concentra two times in recent months after a car accident and then another minor injury. I was new to the area and did not yet have a primary care doctor and I was dreading an urgent care visit. Surprisingly, the wait time for both visits was reasonably short. I saw a different doctor for both visits, but both were great. Good bedside manner, attentive, and capable. They called a few days after each visit to check in and make sure I was comfortable with the medication and improving as expected. And to top it off, the charges were quite low (in my opinion) for the services completed, which was great because I was paying out of pocket as I had not yet met my deductible.
I will, however, add that my boyfriend has also gone there (he saw a different doctor). He came home complaining that she cut him off and would not let him speak or fully explain his pain/symptoms. He felt she did not seem all that interested in diagnosing him. Instead, she just wrote him a prescription and told to follow up with his primary care doctor (which he does not yet have).
Clearly the actual doctor has a huge impact on your overall experience. I will happily return if I find myself in need of urgent care in the future.