Can I use this if my music is Google Play and not iTunes?
It connects to the device, not the player. It can connect via Airplay for i-devices or 3.5mm jack for other devices.
There are plenty of Android apps that play to “airplay” devices.
I paid $99 for a used red one on eBay two years ago and it works as advertised. The biggest downsides are the 802.11b/g only WiFi and the unit loses it’s mind every now and then and you have to hit the reset button with a paperclip (luckily settings are saved). SQ is good, especially for mono. Charging base is elegantly executed. Definitely worth $50 if you can deal with the shortcomings.