I picked up a Surface Book on launch day. i7, 16 GB, 512 GB. As others have pointed out, there were several software glitches for a few months after launch.

I picked up a Surface Book on launch day. i7, 16 GB, 512 GB. As others have pointed out, there were several software glitches for a few months after launch. Ultimately, the software problems have been worked out. For me, the ultimate deficiency is the Surface Book's inability to drive two 4K monitors at 60 Hz. Although not promised in so many words during the launch event (they said "two 4K monitors" without specifying the refresh rate), I had assumed it would support 60 Hz rather than 30 Hz. This limitation convinced me to retire my Surface Book to a purely mobile role and use a proper workstation for 90% of my computing. I expect that a second-generation Surface Book will resolve that specific hardware limitation.