Sorry I hadn’t replied to this until now - Cyberdemon had a pretty good answer for us!
FYI - my SurfaceBook is doing well (it was the top of the line version at introduction, so it has dual graphics cards, maxed out RAM and SSD). I’ll probably upgrade to a 15" SurfaceBook 2 in a year or so.
I agree with what others have mentioned, that MS did a good job developing this hardware to go with the Windows ecosystem. It’s nice to have one machine that handles everything I do, anywhere I want to do it.