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Google Play has been used at least one time at our events. Below is some brief comments about that experience.
A nice feature Google Play Music has is you can download the songs on to your device so you can play them without having WiFi access. More importantly this can be done on not just mobile devices but also on your laptop. Not always the case with other platforms.
Nice Feature...Downloading songs on your device means you don't have to rely on wifi.
At first glance, it looks similar to Spotify. Don't get fooled by looks. For example it does not have a crossfade option. It also does not have a volume control. It does have an equalizer, which we found not to work well.
It's easy enough to navigate and get quickly to the next song without an unwanted pause.
had issues with the "Next Play" and "Queue" features. They seemed to not always work quite the way they normally are supposed to.