I have a Powernode 2 in a second system, and I think it is a solid recommendation for a "small, simple" system. First, it is a good sounding unit. Second, the BluOS interface is very well sorted and user-friendly.
I have mine mated to Elac Debut Reference speakers and I am sometimes surprised at how good it sounds compared to my primary system. My Powernode has also been dead nuts reliable with both wi-fi and ethernet connections.
Downsides? Well, the price is now US$949, but the cost of all audio stuff has gone up recently.