Since this is a ‘first impressions’ topic, I’m still eligible for it as a Rivo owner for just about 1 week right? 
It has been turned on since Wednesday 7th, playing music on and off. I shortly used the original power adapter and changed to my 5v Farad LPS pretty soon.
I know that ‘burn-in’ is a thing, but with these 2 new components I have experienced burn-in like never before. My first impressions were ok-ish, then it got really good for a short period of time, after which I thought for a day or 2, what the heck did I buy, so boring, harsh and flat sounding it was.
But things are now stabilizing and boy am I happy with this combination. The Rivo is a real joy to listen to. I’m a big fan of Volumio’s design approach to keep things ‘simple’, not tinkering with the music signal along the way.
Maybe it sounds a bit crazy to anybody having not experienced it yet, but to me a real good system let’s you hear the empty space around the music. I describe it as the room acoustics, ’ showing’ you the actual room in front of you and around you, like you are actually in the room of the performance, not just looking at a picture in front of you with some depth to it. The Rivo let’s you hear that in spades, really awesome.
The sound is very clean, it has a very black background, while being very organic and dynamic at the same time, no stress. This makes it live like to me, and that’s what I’m after! 