Microsoft’s Surface Book 2 is the most powerful mobile Surface device yet. It easily blows away the Surface Pro, Surface Laptop and, of course, the old Surface Book. It’s also one of the odder devices in the lineup, though. It’s not just a Surface Pro with a rigid keyboard. It’s a relatively heavy base with a powerful processor and graphics card and a big battery — and it has a surprisingly light removable screen that turns it into a tablet and that features a less powerful processor and graphics chip.There surely a world of difference between the performance of these low-end and high-end machines, so you get what you pay for. But Microsoft’s message here is pretty clear: the Surface Book 2 is basically a mobile workstation for those who want to edit videos and photos, play games on the road or just need a really powerful mobile machine to crunch numbers or compile a Linux kernel or two. It’s Microsoft’s challenger to the MacBook Pro and it’s not shying away from the comparison.