When I got my Surface Pro way back when, I had some similar issues. I had to update the drivers for the screen and pen to the official Wacom release instead of the Microsoft release and afterwards it ran amazingly well. It was so nice that I've been eyeing one of those absurdly expensive drafting table style Wacom setups for my desktop ever since even thought I could never justify the price. I've considered upgrading the Surface Pro as well for a larger screen and lighter body, but the Pro 2 does all my normal tasks (mostly matlab and putty) really well and the fact that the pen is now sold separate deeply offends me.