11“ Pro with Nanotexture is the best content consumption device I have ever owned. I have it basically configured as an e-reader - no social apps, notifications disabled etc - to reduce distraction. Really enjoyed using it on our vacations this summer, reading books, comics, magazines in Apple News etc - reading in the sun is dramatically better than the glossy display and, in my experience, equal to or better than dedicated e-readers. For me, 13” is too big to use one handed.
Major downsides are of course cost especially since Nano is only available on 1 TB and above and battery life - unlike with an e-reader you definitely have to charge nightly.