Currently have a UnitiQute/200 running ProAc Tablette Anniversary in a small living room system.
Don’t use the UQ amp so thinking about replacing it with a 172 or selling the UQ/200 and replacing both with Uniti Atom. Just don’t know how much better the front end of the streamers have gotten with the new Uniti releases.
I use an Atom in our living room, having moved the bigger Naim system into another room, and I’ve been very happy with it. It’s no match for a well set up separates system, though, and even though the 172 is a combined streamer/DAC/preamp squeezed into one box, I’ve heard it sounding remarkably good with a 200, and I think you’ll find that it performs better than the Atom. It will also happily drive a wider range of speakers.
The advantage of the Atom is the updated streaming platform it runs. This might not matter if you just stream from a NAS, but for web streaming, Roon, Chromecast, AirPlay etc. it is a step forwards.