All Auto Zone stores are technically the same, but I've seen service differ widely depending on the location. I went to this store once when they were very busy. I needed to get some headlights and I needed some error codes read on my car so that I could identify why my check engine light was on. The salesman who was going to help me made sure to continually identify that he hadn't forgotten about me as he worked through the queue of people who needed help and arrived before me. They were doing a lot of battery installs and code reads that day. It was nice to know that I wasn't getting overlooked.
For reference, all Auto Zone stores will check error codes for free and print out a report of the codes. They also loan tools if you need something to fix an issue right in the parking lot or to install a funky item. The tool rental has helped me out a few times.
On this particular visit, the error codes my car reported were pretty broad and signaled four or five different potential problems that would all require very different solutions. The salesman me gave me a few tips to figure out the root cause of the check engine light and told me which items would be cheaper to fix first if my diagnosis didn't return anything useful. That was very useful--he didn't have to do that and it saved me a lot of time searching the web for help.
Overall, I'm a fan of this particular store. I would go again if I'm in the area and need car parts and such.