https://arstechnica.com/gadgets/2017/11/surface-book-2-review-monster-performance-but-lightning-hasnt-struck-twice/

Introduced a little over two years ago, Microsoft's Surface Book was the hybrid laptop that I had long hoped the company would build. Like the Surface Pro, it worked as a true standalone tablet, but it had the all-important stiff hinge, making it suitable for use on your lap in a way that the Surface Pro's kickstand and Type Covers never really supported.

The Surface Book was not just a useful form factor; it was also something of a technological showcase. Other hybrid designs I've used, such as the ThinkPad Helix, had clunky mechanical linkages between the tablet portion and the base. The Surface Book boasted a clever software-controlled system. The fulcrum hinge design, which helped keep the device balanced when the screen was open, is elegant and visually striking.