Aw, I wish this had come out a launch. I haven't ever connected my switch to a TV. I guess I can sell mine and buy one of these.
I wonder how they'll handle the motion controls and gestures that you can't do in handheld mode. I remember in Mario Odyssey in particular there being a couple of moons you could only get by detaching the joycons to do certain motions (the one I remember is that you could make the frog jump higher by using the joycons than by any other method).