I have the UX280N. These things are very nice, and I find the trackpoint to be very ergonomic and useful.

However, the 2h battery figure is real. On the good side, it's not like modern laptops where the battery life is 8h when you stare at the wallpaper, and 3h the moment you actually move the mouse. Battery should always be around 1:30h-2h no matter whether you use it heavily or lightly.

Additionally, performance is not that good these days. In my experience it is only slightly better than the second gen Atoms. Still a lot better than the N900 though.