I have purchased a Surface Book recently and I can tell you, with first hand experience, that the N-Trig technology is defective. It is not good for detail work and drawing slowly because the cursor / brush will shift around under the pen when you draw lines that are not vertical or horizontal. so for example, if you want to draw a line at 45 degree angle you will not get a straight line if you draw slowly...there will be a "jitter" effect that produces a wavy line instead of a straight one. The same proble is evident anytime the pens moves at angles, for example when drawing curves, circles and ellipses. It's a real deal breaker and i'll be returning my surface, but not before i warn everyone i know in forums and also incoming students. Below is an example of what i mean, i did this in photoshop, but the same poor, defective performance can be seen in any graphics software that doesn't correct your lines with software such as what you might see in Flash or some Illustrator drawing tools.
If you draw quickly the line will be smoother, but for precise work and anywhere you need control it is unacceptable...and basically: DEFECTIVE.