It's going on one week since I upgraded my Unibody Macbook with the 500GB Seagate Momentus XY Hybrid hard drive and I must say I'm very pleased with this drive! Loads of space and a noticeable improvement in speed for most of the tasks I do. For one thing, the bootup time has been cut in half. Most of my common applications open almost instantly now! Yes, this drive was a bit more expensive than a non-hybrid 500GB drive, but I think it's worth it! Just wanted to give my impressions now that I've had a week to use it. If your thinking of upgrading your macbook hard drive, and your not concerned about spending a little bit more money, I highly recommend this drive.