There is nothing wrong with OEM hardware, the specs are the same because the retail kits contain the same drive with the same serial number, no way there should be any performance or quality difference. As long as you know which one you're getting, and know its serial number, you shouldnt get a drive thats different from a retail a package. And of course, you wont have a fancy box, IDE cable, partitioning/diagnostic software, mounting brackets, et cetera.