> If you are thinking of getting one, take get surface 1 off from the ebay.

This is really bizarre advice, especially given that most of your complaints do not apply to the Surface Pro 3.

"border accuracy with the pen is awful" - SP3 uses an entirely different pen technology

"touch keyboard is useless rubbish" - Get the type cover instead. I'm pretty sure the touch cover isn't even manufactured for the SP3.

"original pen has only one button" - Not the case for the SP3.

Disclosure: Microsoft employee