For those of us living vicariously by just updating our keyboard, pen, and/or dock: I didn't want to try to slap this stuff among all three threads (Surface Pro 3, Surface Pro 4, and Surface Book) - so decided to start a thread for those of us "just" upgrading the keyboard, pen, and/or dock, I wanted a place to post our thoughts, comments, reviews, longings, desires, you name it. I'll start with: NEW PEN The feel of the pen on the screen is MUCH better than the regular pen, BUT, I really attribute this solely to the new nib, which gives you more friction than the old nib, I was told by customer support that the old pen can't use the new nibs, which is a shame, but if I decide to keep the new pen, I may do surgery on the old pen and sub the H nib for the standard nib. The reason I say "if" is because so far the only improvement (for me) has been the pen drag on the screen - much more real life. Obviously, I'm not using it on a Pixelsense screen, so hover, latency, pressure are all still the same. After nearly 18 months, I've gotten used to using the two buttons and not having to turn the pen over to erase. If you are new from Wacom, it is great to erase with an "eraser" but I think it is more efficient to push the second button while still on the screen to erase. Perhaps it's actually a step backward. So far, a hmmmmm...if N-Trig makes different nibs available, I may just stay with the old pens... More to come on the keyboard (need to run Windows update) and dock soon.