Hey maxpert. One of the Co-founders here. I'll let others comment on how they found using the framework however we've been using it internally for client projects at our services company for a few years (http://www.roundedlabs.com/#work)
We're also in the process of creating a set of complete end to end apps for which we'll be releasing the source code to.
An example would be something like: https://appsto.re/gb/ZiUPdb.i
Feel free to drop me an email ansar [at] redbeard.io if you need help with anything. Ansar