I have recently replaced my ThinkPad T42 with a new X41 Tablet.

Even with the 8-cell battery the unit is quite small, light and comfortable. The edge of the battery actually works well as a handgrip while in tablet mode.

Hardware wise, this is one of the best engineered laptops I have ever used. This is the first Lenovo ThinkPad I have ever seen, and it appears that they have actually managed to increase the build quality. Other than having to get used to the small backspace key and the position of the delete key, the keyboard is better than the one on the T42

My biggest complaint was that out of the box the X41 Tablet is very slow. After removing all of the pre-installed software which I did not need, and applying all of these tweaks:

http://www.kadaitcha.cx/performance.html

The machine is now humming along nicely and performance is back on par with my faster T42. If any of your intended applications are disk intensive, it is important to note that the 1.8" hard drive in this system is fairly slow.

Once I got over my fear of scratching the sreen I have come to enjoy the tablet's excellent stylus performace and suprisingly accurate handwriting recognition.

Bonus: If the PAX in front of you reclines their seat, you can watch a movie with the screen flipped over and flat, or flipped and slightly tilted up.

Hope this helps. Good Luck!