Nov 1, 2015
There are lots of reports in the technology press about lots of problems with the new Surface Book. Here is one such article:
That article was from 5 days ago and most of those bugs are still present (I know, I have one).
I suppose this is inevitable with such a new product and OS. Heck, even Apple has lots of these: when I upgraded to iOS 9 on my iPhone 6 last month it led to tons of bugs on my iPhone that took weeks to finally fix with the release of iOS 9.1.
The Surface Book issues almost all seem like software issues, so auto-updates should take care of them. But you may want to wait a while before getting one if you were thinking about it.