I have bought several parts from RockAutoParts.Com and could not me anymore satisfied. The prices were superior to the big name discount sites and local stores. I bought parts for my 2008 BMW 528I and my 207 Nissan Quest. They arrived ahead of schedule. The surprise was that the parts that came were original MFG parts. Not knock offs or Aftermarket. Prior to ordering I contactedthe dealers as well as two or three other Auto Parts Stores and check prices and product manufacturer. I find that except for the dealers (whose quotee are usually for the very Rich or the very ignorant) the parss are made by the same manufacturers. Navigation for parts is excellent and if you know what to order, you will make a purchase. On two separate occasions I find it necessary to contact Costomer Service and was successful in doing so. I pay with PayPal and my issue was (Merchant Authentication Issue) with Paypa, l not RockAuto They are also very helpful by giving me suggestion on how to resolve this situation with Paypal.
Therefore; the only comparison that is relevant is the price. Rock Auto is ahead by a country mile.
Caution: Dont be put off by paid or phoney reviews. This company is here to stay if they continue to offer superrior products at superior prices and a dimely delivery. I