According to the review on brighthand.com over NOKIA N810, this is the
best handheld device so far. Some of the features they really enjoyed was that you can can connect using Wi-Fi and also to a mobile phone and using bluetooth, so that you can connect using a mobile browser. It's
easy to use Google sheets and docs over QWERTY keyboard.
It also has an address book to store email ids. They do warn that you should buy a simple cover for the device to keep it protect from scratches. Overall, Brighthand says N810 with a smartphone make an outstanding mobile solution.