Feels good. I wish the OS was rendered in 1080p but that's such a minor gripe. I only ever really notice it when I dock the Switch because I'm right up close to the TV.
I find the OS to be really slick. Switching from sleep, to home screen, to game, back to home screen, to eshop is all seamless. I've used the screenshot button a lot more than I thought I would have too.







