Android Multi player Game

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Mobile

Android

sockets

Hey Guyz,
Can anyone guide me how to achieve multi player behaviour in my simple android game.
I have a simple game based on client and server model but now i want to give it a touch like real time multi-player in a module, where some action performed by a single users will be visible to other connected players as well immediately.
I tried push notifications(they were slow), continuous look ups to my server for any new messages(not a good approach) and Finally Sockets. i am able to implement such behaviour when android clients connects to Windows (C#) server using TCP Sockets and server keeps tracks of connected users and after receiving message from any client it then send to all the connected clients. I have opened up specific port at my server end the question is , is this approach is good for such type of requirement or what alternative i have. secondly if this is ok , are there any possible risk factors involves in it. Thanks