By me, you should inquire carefully into landscape use if you want to use it, and maybe virtual screen area and compatibility, and software compatibility with unusual resolutions. Not all Tablets are equal here, at least in Windows XP. These words were written in Fitaly on-screen keyboard on a Samsung Q1 UMPC in 480x800 landscape. This device has 800x600 scrolled and pixel-compressed modes, but not landscape.
I've also read that first-generation UMPC displays are not power-efficient, having been made for automobile equipment where power is less restricted, with an impact on battery life. I don't know if that's right, but maybe data on screen power use should be checked.
Touch stylus users - with on-screen keyboard, say - may find they do scratch or wear holes at particular screen locations, so a protector is worthwhile, and maybe even a protector protector - specially made film (such as iPod protector), plus inexpensive Scotch tape on top in heavily used locations. As the Scotch wears away, you can replace it without discarding the proper protector. But dirt and scratches on the film will show up real bad.