@emil The latest Lumin Android app was released on October 12, if I remember correctly. Lumin has a dedicated Android developer working hard to quash a bunch of issues with the Android app because of the problems people were running into.
With respect to your question about Aurender, a lot of people really like the product and it works well, but their philosophy is slightly different. Lumin's approach is more of an open standards-based one, where you can use it with lots of different types of music library setups, backend music server software, and front-end UI software. With Aurender you need to use their software and their architecture is optimized for having the music files on the Aurender unit itself.
I would recommend at least trying the
Lumin app (you can download it and use it, but not play anything, without buying any Lumin hardware). Aurender has some
video tutorials for their app. If you don't like the Lumin app, you can use any other UPnP control app instead.