What's your thoughts on google play multiplayer service?

I want to make a decent multiplayer game and I am currently low on budget.
So I want to choose google play service for my game but I can’t find any tutorials or opinions about it.

What do you think about it guys?!

I’ll just put this right here.

It’s been late
but here is the good multiplayer tutorial using google play games

http://bhattakash.com/creating-multiplayer-game-with-unity/

and a good Asset too: Easy Google Play Service - Multiplayer | Integration | Unity Asset Store