Long as you have a place to prop it using the little kickstand, or can rest it on chest, knees, pillows, etc., I'd think the Surface Pro would make an excellent ereader. I have one at work (though I don't use for ebook reading currently), the aspect ratio and display quality on those things is fantastic. I can see a case for doing that.

This is a side issue that I won't pursue further as it's a rabbit trail to the thread. :-) But I have noticed from trying to use Windows a few times as my ebook reader on a small tablet or laptop, there are two primary issues: (1) A relative lack of good ebook reader apps (the only really good one I ever liked much besides using Kindle or Google Play browser version, is Freda+), and (2) Windows 10 apps and UI still just does not seem quite as 'touch-optimized' as the iOS and Android platforms. It's relatively more clunky and painful (to me, at least) to try and get things done in 'tablet mode' on a Win10 device. This is regrettable as I think Win10 has the built-in power to be a brilliant OS for ebook reading. But somebody needs to ramp up the touch-optimized app development for it to realize its full potential.