I have easily ordered over $5000 in rock auto parts. The only drawback is their 30 day return policy, which has burned me a few times with customers who fail to return for the work. I have however, sold the parts as new on ebay and recouped almost all my money, since their prices are on the lower side. Im sure I was out some shipping costs here and there. They also understand they DO make mistakes, and have corrected EVERY ONE efficiently and without much effort on my part. I use a combination of Pepboys commercial, advanced commercial, napa commercial, and rockauto. I always price match. For premium or OEM parts I usually use rock auto, and have not been dissatisfied.