Hey -
They are good... for some things.
Great for on the sofa, browsing the net.. watching some stuff on the move.
Not so great, for anything with typing, games etc.
You can do some cool stuff to it though I tihnk, and use it for all sorts of strange tasks if your techno inclined.
So, how does it work? You just connect it to your router via Wifi, like your laptop, or phone. Simples.