We were excited ever since the first Surface Book came out in 2015, since it gave the option for a discrete GPU. Now we have a chance to test with a Surface Book 2, thanks to Microsoft for providing the hardware for testing.
We are provided with the 13.5" model. Coming from the 12" Surface Pro, I like the bigger screen size. The hardware feels really solid and clean. And of course, with an nvidia GTX 1050, we get very good performance, although it gets a bit hot and the fan would kick on.
When you detach the base, the GPU performance drops significantly, so you would like to attach the base when you use Expresii. In fact, when I detached the base and held the tablet part only, I realized how convenient the kickstand of the Surface Pro is! Note that the tablet part doesn't have any USB port (or video port), so you can't really use it in place of, say, a Surface Pro. I believe they designed it for only brief detachment like for the case of quick presentations.
See the calligraphy process video in Youtube: