Very nice little distribution and web interface. It's designed around music listenning only, so if you're not a music fan, you can switch to something else. Volumio works very well on my 2 Raspberry PI 3, Raspberry PI 2, and my Raspberry PI Zero to bring multiroom audio to my appartment. It's very well designed and easy to use.
Not everything's perfect of course: the queue system is very basic, and there's much work left to be done on the sync part of multiroom. But anyway, I've been using it for 6 months, and as a music geek, I can say that Volumio looks very much like what I've been waiting for ages.
As for the system part, you don't need to do much with it. You can ssh, and access your (debian based) linux box, but you probably won't need it much.
So if you're a music fan, and happen to own some pieces of (low) tech hardware and/or DACs to enlight it, look no more, Volumio is the place to settle.