I have recently bought myself a Surface Pro 3 - mostly for the purpose of game development and drawing/sketching some ideas for future game designs. Really like the use of the pen (e.g. in Manga Studio 5). The aluminium feels nice and cool. The downside is that it feels a bit slippery between my fingers especially when I need to work with pressure and lacks then a bit of control. Also when drawing it happened a couple of times that I lost the he ideal position to quickly reach the eraser button because I do tend to roll a pen between my fingers when it's shaped round like this one.
To fix that I have tried out various rubbery pen holder helpers that you can buy in many paper shops (see picture). The triangle one - after being shortened - was a perfect fit and makes it so much better.