I got one. I never use it. I have an expensive tablet and I rarely use it either (a phone works better for most web browsing because the tablet is too clunky to carry around, but I do use it to watch udemy videos when I'm using my laptop to take notes or work through examples). You see, it turns out, I love keyboards and track pads and mice! I imagined that I'd find it far easier to do diagrams and mind maps in the Rm2. And it's true that it's much easier to draw on a device designed for drawing. But it also turns out, I rarely have to do that, and this thing is shit for basically everything else.
If I remember that I've got one of these sitting in a drawer, it's nearly always dead. And if I remembered to charge it and I can actually draw something, the drawing is hard to use. Like, I can't just pick up the rm2, do a sketch and have it quickly embedded in a document. It's clunky as fuck, even if you root the thing, get ssh and all sorts of other sync stuff set up. The rm2 let's you make pointless sketches and hand drawn notes that can't be used easily outside the device. It's good for nothing else. And I'm willing to bet that that's not enough for most people. If you want pencil and paper, save yourself a shitload of money and just buy a pencil and some paper.
Edit: one thing I was kinda interested in was using it as a terminal - there's an app for this but it's too much hassle to set up for the novelty of a paper-like terminal (with no colours!)