1. The screen, as described, is much nicer. Viewing angles are far wider. Blacks are deeper. This does come at the cost of somewhat cartoonish oversaturation. 2. My unit has an almost imperceptible constant vibration. Ostensibly it's the same exact 250gb drive as the uMB. Not sure why. The uMB was dead calm. 3. The difference between 2.4ghz and 2.53 is greater than I'd imagined. Photoshop opens blazingly fast now. 4. The finish on the case feels a tad rushed. The edges are sharper and a bit rough visually. 5. The machine runs noticeably cooler than the 2.4. Not sure how or why. 6. It sips, not chugs, battery juice. I got maybe 3 hours from the 2.4. Getting 4+ now. 7. Somehow, I gained nearly 60gb of free HD space after using Migration Assistant, but I can't find a single missing file. Any idea how that works? 8. The keyboard is smoother, the touch feels less clacky, and the keys aren't as sharp. So far, very happy.