Jonathan, I am sure you are correct on the measurements.
I will even give you that the N810 is only slightly larger and weighs more than the 800. The keyboard is a tossup as most 810 users on trips will still take a full size foldable keyboard rather than type with their opposable thumbs and spill Coke into it. I can't yeild however on the GPS. I own several and will simply say to start the argument that from a safety stand point incorperating a GPS with any other devices in which both use the same battery is NOT wise. As a toy - fine - as a serious approach to navigation NO! - buy a stand alone GPS and any of the Nokia Tablets you like. //ji