I have not used Google Play Game Services, but yes, I am working on a multiplayer game using ShepHertz's AppWarp cocos2d-x SDK.
I used it for iOS (but it supports Android, Marmalade and BlackBerry 10 as well)
Some of the features that I really liked are:
Persistent Room property management
Match making based on the number of users and properties
Out of the box turn based gaming APIs
The best part which i liked about them is their Dev Center.