For some people (including my wife) the deal breaker is the screen size. Not the keyboard. I know they are close but for some people it matters.
The Surface Book has performance that utterly demolishes its competition. Seriously, 16 gigs of RAM in a body similar to that of an ultraportable? It's a monster and I for one am glad that Microsoft is doing everything in its power to polish it to perfection.
surface book its just for those who type a lot and take advantage of that little better keyboard
but for the rest...it's not a great product like is the surface pro 4, the new keyboard for the Surface pro 4 is just so close to the surface book that does make a difference
Surface book in tablet mode its just too faaar from surface pro 4 in battery life and that hinge always scratch my desk if i move the laptop
i always had problems with the removing the screen from the keyboard....i return it and took the surface pro 4