I use the on board keyboard, when in bed or for speed when out and about and unable to place the SP3 down.
I use the typecover when I am in the motorhome, in the car, for speed when I am moving around and able to put the SP3 down.
I use the Microsoft Wedge bluetooth Keyboard. When at my desk at work or in my study at home. This is small but still gives a full size keyboard. Very good and thoroughly recommended.
For what it is worth I have the Microsoft Wedge bluetooth Mouse and found it almost impossible to use. So I have a smallish mouse connected via the USB port - I have a four port USB adapter when at my desk.
Regards
Chris