It won't replace my laptop, but a touchscreen PDF reader with an excellent stylus and build-in cellular modem is a compelling piece of kit already.

Add in a keyboard and touchpad that's good enough that I can fluently type on it, and I can imagine a lot of scenarios where I'd want to bring just it. Unfortunately most of them involve being able to leave my house and go somewhere else :/

I do need more control over the keyboard layout (see my other comment if curious), but will probably get this when that becomes possible.