I had an X25-M in my hands yesterday but RMA'd it to newegg and got the Momentus XT (see my thread). Yes, performance is very good but it only remembers your most used apps. I want consistent speed across the board no matter which app it is. Also, the main reason I am returning is I did not think the vibration was too much until I threw my 5400 Hitachi stock drive back into the machine. It's night and day difference. So I'm going to Optibay+X25-M it. Sucks I have to deal with returns and bite the 15% restocking fee on the Momentus XT (and about $12 for cancelling the order for the optibay alternative+ SATA SuperDrive enclosure) in addition to returning the item, but now I know. Patiently waiting... Also, I felt the platter stopped spinning and spinned up again a few times, not sure if that's because stuff is loading off the SSD or premature signs of drive failure.