I had to register just to say this... I was extremely frustrated with the Surface Pro stock pen. The plastic tip slides on the screen very easily and gives little friction so drawing and writing requires a lot more control than I'm used to. Then I read tips about the Bamboo Feel pen from Wacom that has a different soft rubber tip that's supposed to give better resistance on the glass screen. So I purchased the Bamboo Feel pen, and sure enough, it was better. In fact, it was also more accurate than the stock pen. But since the Bamboo pen does not have a magnetic strip, it needs to be stored elsewhere, and not along with the Surface Pro. I found myself constantly leaving it at home since I could never remember to slot it in the bag the next morning. Especially if I was in a hurry. So I was still stuck with the stock pen for the most part, since it's just easy to attach it to the tablet. Today, I was curious, so I tried to take the nib off of the stock pen. If it's a Wacom pen, I should be able to change the nib, right? To my surprise, I was able to take it off. So... yeah, you can replace the nib of the stock pen! Wow! But then... what nib fits? I have a Wacom Cintiq 13HD handy, and it came with a bunch of different nibs, so I tried those first. None of them fit. The Surface Pro pen had too small an opening. Then I remembered the Wacom Feel stylus came with some replacement nibs of its own, so I took them out and tried to put them in, only to realize... it's too short! In fact, I pushed the nib in so far that it disappeared inside the hole. Out of sheer frustration, I took the Surface Pro pen to the toolshed, took out some sand papers, and... I started shaving off the tip. I thought that maybe I could shave the tip enough that I could pry out the nib that was stuck inside. After a few minutes, I was able to test my theory. I shaved down enough of the tip that the nib was exposed, and I could take it out easily. Unfortunately, I also killed the nib in the process. Part of the nib was shaved off with the sanding, and the prying caused a huge opening in the middle that snapped the nib in half. But my misfortune didn't stop there. When I put the stock nib back in, it stuck out farther than last time. It seems I overdid the shaving. Curious... I put a new Bamboo Feel tip back in. And this time, it fit! I tried the "new pen" out, and... wow... the new tip is soft and resistive, almost like fine markers, or a very well-used pencil. And best of all, accuracy improved by quite a lot. So much that I think this may well be the best I have ever gotten out of the Surface Pro. That includes all of the crazy calibrations and drivers and troubles I had to go through. And then I found out... I can buy replacement Bamboo Feel nibs from Wacom for something like $5 a pack. You can guess the rest. I think I've made my Surface Pro pen inherently more usable... and re-usable, since I can now use official Wacom nibs with it. My Wacom Cintiq 13HD is still better as a tool, but the Surface Pro is close enough to it now that I don't miss the Cintiq anymore when I go roaming. So I thought I'd share this for those who may be interested in getting more out of their Surface Pro. It's now my favorite tool for sketching and light drawings!