I've bought one of the book model leather cases with the plastic over the keyboard.
While I find it really nice (although a bit bulky) and protects the device quite well, I have found that the slide switch doesn't work when the n810 is in the case and it is always in "open" position, no matter if the keyboard is closed or open.
Also, I think the plastic has moved or loosened the switch, because now I have to press the lower right corner of the screen when I close the keyboard to move the switch to "close" position.
Do any of you have such problems?