We purchased from a different carmax (prior to moving) before and that one was awesome so when we looked to purchase a car we sought out a nearby carmax.
This particular location doesn't seem to do a very good job in the service department when it comes to hitting the 120 checkpoints they advertise before putting a car in the lot for purchase. All of the cars we test drove had issues that were a part of what was supposed to be a part of their checklist. That doesn't give you a lot of confidence to purchase.