Thanks! The performance is very good with 4GB RAM and an SSD-like drive. I can easily work with 300dpi A3 images.
There are no keys but you can buy an attachable keyboard, which I recommend.
I have still not palm rejection. Instead I disable the touch screen (and only work with the Wacom screen layer), as I haven’t managed to make pinch to zoom work. There is a FLOSS tool called Touchegg that should be able to solve this, but I haven’t had any luck sofar.
I have also tried out Krita and it seems to work just fine.
So, awesome FLOSS tool. Kind of a poor man’s Cintiq.