I went to these guys at the recommendation of my friend (who is a really good home mechanic and very critical of shoddy or unethical service). The reason I took my car to them is I found out that the factory dealer misdiagnosed the repair (said I had a faulty battery and alternator). We'll, I had just purchased the battery a few months before, and in order to try and get it replaced, I had to go back to Walmart and get it tested. It tested fine, so I took it to two more places (Autozone and Certified Auto) and they also confirmed it was fine. I went to the factory dealer, told them to give me my keys (and I wasn't going to pay for a diagnosis), and I towed my car down to Certified Automotive late in the day on a Friday. Certified had it fixed before closing time, and still beat the factory dealer quote by $100 (excluding the additional $120 the factory was going to charge me unnecessarily for a replacing a good battery). From now on I'm going to go to Certified Auto first before I take anything to a factory dealership. The factory service techs aren't all bad, but I won't ever pay a premium unless I'm absolutely sure I'm getting more for the money (more than just empty talk).