Arrived from Newegg this afternoon. Removing the screws on the bottom plate of the 13" was really hard imo. I had to use plyers to have enough grip on the screwdriver to remove them, and it slipped twice (with hairline scratches) -- probably better anyways. I wear belts and worry about the buckle scratching up the bottom, but this just eliminates my OCD -- and it doesn't look horrendous but my heart stopped when I slipped, hoping I didn't too badly scar the machine . The drive is noticeably faster than my stock Hitachi 250GB 5400rpm drive (which is now in an external enclosure: http://www.newegg.com/Product/Product.aspx?Item=N82E16817816001). I also notice an increase in the system vibration, but this probably a standard thing anyone would feel going from 5400 rpm to 7200rpm. I have yet to see how it holds up after remembering my favorite apps and battery life but will report once I have a better grasp. If you have any questions, ask away!