I have a motion tablet, and the X220T is likely to be my next laptop, assuming I buy another one. I use my tablet daily, as a tablet. My original interest in it was as a writing tutor for learning Chinese. You can adjust the sensitivity on the HWR built into Windows 7, from fairly lax to very precise, including stroke order.
But then I realized I could use it to mark up papers that I was reading, assignments that I was grading, and I find the pen a MUCH better alternative to the mouse (as I've said elsewhere, I tend to use either the mouse or the keyboard, but not both at the same time). It's also a lot of fun to use the tablet for games like Diablo. It's much more immediate.
A couple people in my department have the 201 tablets, and while they recommend the extended battery, otherwise they are very happy with the machine. I've used them a few times, and been quite happy with the pressure sensitivity. They were not willing to give up the amazingly impressive HWR in Windows 7, though, so that's what it was running. Plus, for PDF inking, BlueBeam just can't be beat. OneNote and
IneSeine are also incredibly nice to have, and I have yet to find suitable replacements in Linux.
For my Linux needs, I just run a VM.