OK so I bought the notebook back in May, not that long ago. It came with a 250 Gig HDD which I knew would be insufficient for me. I bought a WD Scorpion Blue based on several tests and reviews, it is the best overall drive out there even comparing it to the 7200 RPM drives. Well all my 'tests' are done, the uMBP is definitely a " keeper " and now I am installing the 500 Gig HDD as we speak. WOW could Apple have made upgrading the drive any easier. One screw holds it into the notebook - remove 4 screws from the HDD and install into the new HDD. Install the new HDD into the computer attaching one connector and one screw. Reinstall battery, cover it up and INSTALL the OS. I can't wait to get it " off the bench ", software loaded up and hit the road with it.