i've had a Chromecast Audio for a few months. I have it connected to a Devialet 120 via an optical cable. My speakers are Joseph Pulsars. I've been pleasantly surprised at how good it sounds. I use an iOS app called Tunein Radio to cast internet stations and an app called Musicstreamer to play from my music library via an Apple Airport Extreme. I have an external HD connected via USB to my router so I'm using that to cast to the CCA. Initially I had some problems with the Tunein app as it would not cast consistently but they recently upgraded the app and I hope it will be more reliable. I would say the the SQ with the CCA is better than what I had heard previously from my Mac Mini. I wasn't expecting that but I now think that is the case. It's very easy to set up and use. A real game changer in my view.