Hi Sören, I'm using it atm for a major project and so far it's working brilliantly... There's also the fact that Vue can just be "dropped" onto a page with a link to a CDN and you can start doing really useful/cool stuff immediately, or if you need something more complex, there's the CLI for pre-compiling/transpiling with ES6/7 etc.
Also, this would be THE perfect platform for Vue to gain even greater global traction - something I was thinking about the other day actually, and I was thinking along the lines of Microsoft becoming its "sponsor", but if WP stepped in, this would propel Vue from the amazing place it is in now, and gaining traction/adoption right across the spectrum, from small outfits to major agencies, into a major force in the JS framework arena.
It should also be noted, that ANYTHING you can do in React, you can do in Vue, even JSX if you must, and just going on my recent experience with it, it just works, straight out of the box, and works brilliantly, too, one example being the transitions effects and the control it brings to front-end dev....
Anyhoo, my 2c but we'll using Vue even if WP decides upon React!