I've been using this framework since Rob first announced it on Hacker News in 2015 and now the new version Aurelia 2 is out in beta. I've built something with it already because it's so easy to use. It's pretty much backwards compatible with Aurelia 1, except for a few differences.
It is so simple to setup. The architecture is powerful though and it seems to be pretty fast in terms of performance as well. I think more people should give it a shot.