I have been taking my car to H1 for approximately 5 years. Recently, my car wouldn't start one morning. After I got it jumped I drove it to H1 to get it diagnosed. Carlos immediately hooked my battery up and told me it was a bad battery. Since my battery was under warranty I took it to Autozone where they refused to replace the battery. Instead they charged it and sent me on my way. Five days later my battery was once again dead. I went to Autozone and they told me the batter was fine and instead it was my alternator. Once again, I went back to H1. Carlos immediately hooked my car up and showed me the alternator was fine. He handed me a slip of paper to show the guys at Autozone what the problem was. I went to Autozone, after a few jumpstarts, and once again they told me the battery was fine. After heated discussion, they retested the battery which showed it was defective and replaced my battery. H1 is trustworthy and I will never take my cars anywhere else while I am in Arizona.