I have a 3400 and I have upgraded it from 2000 to XP Pro and it runs great. I hae a toshiba Tecra 8000 and it runs slower than this one does.
Few quirks but if you check the forums like this and ( http://www.tabletpcbuzz.com/) and search for 3400 and you will find several items to walk you t5hrough it easily. Only issus I have had is not rotation of screen and no hnadwriting in XP Pen only works like a mouse but hey it is great for most things.