On one side you have the keyboard and touchpad on the other side you have an emulation of clicks on an android tablet. Just plug it in and the android immediately recognize.
On our android multimedia solution that keyboard is convenient because we are at a distance from the screen (projector connection).
I also used with Raspberry PI solution 2. I do not need to install any driver. Raspberry on, I put the dongle, I turned on the keyboard and it worked on. Also on the Raspberry PI 2 in XWindows, the touch side well simulates the mouse.
I find nicer than the smaller keyboards but it takes up more space by cons :).