For the past few weeks I've been using a Surface Pro 4 -- something I picked up just before I headed to San Francisco for Microsoft Build 2016.
Why did I opt for the Surface Pro 4 over the Surface Book? I already have a very functional laptop (an Macbook Pro actually), and I wanted a tablet that was actually a functional device (and I could handwrite on!). The Surface Pro gave me more bang for buck in this regard.
It's even powerful enough to let me play Prison Architect ;) (And, of course, run a small dev lab in HyperV)