Been playing with the Wacom Stylus feel carbon.
This is like going up from a Toyota Camry to a BMW. It just feels so good on the glass surface. Whereas the default Surface Pro 2 pen has almost no friction, this has the perfect amount of friction. It comes with multiple nibs of two different types. I haven't tried out the other types yet. The barrel has a good diameter, like a high quality real pen. I never really complained on the thinness of the default pen but after using the Wacom one, it's kind of hard to go back. It's also made of high quality materials (whereas the SP2 default pen is all plastic).
I haven't installed Wacom's driver yet (still using the default Windows driver) but it's a little bit more accurate as it is than the default SP2 pen, but it's not really that big of a difference.
I do miss the eraser on the back of the pen though. It's a big deal because there's only one button (which is used as the right-click button). Now I'm having to either select the eraser function in the software or highlighting the scribbles and then choosing delete. If it had the eraser on the back, I would emphatically say the pen is worth it. At $80, it's pretty pricey but it does feel luxurious to use.
I already put away my SP2 pens as the backups. With all the included nibs, this Wacom stylus should last me a very long time.