I'm not saying their RAM is any worse than other sellers, or more likely to be defective. But their return and exchange policy needs help. In past experience with various e-retailers, once I put in a return authorization, my replacement was shipped immediately and I was supplied with a mailing label for the return. With MaxUpgrades, I'm paying to ship back my defective RAM (including insurance on $800), and I apparently won't receive my replacement until it's arrived back in California. Which basically puts my mac pro out of commission for a week if I pay $15 for Priority Mail plus insurance. Lovely. Buy from a more established retailer with a better return system - if you pay any more, it's worth it.