I had to buy a second tablet (another N800) too, because my primary device's touchscreen is "knackered" as well; it has been so badly abused over the past year (yes, we can all sing "happy birthday" to my "Millenium Falcon" N800) that the left side reports very incorrect pressure info.

All I can say is that I wish I had been in the right place / right time in Berlin to "obtain" an N810 too. I'm pretty much in the dark when it comes to things like N810 keymapping etc.