I have been using whatsapp since last three years and have that this messenger is the best messenger for nearly all the platforms ranging from android to apple store.
The interface is so easy and good that it makes it better than all the other apps available in the android market.
The message delivery rate is so quick that it even works very fast on slowest of the net connection. the smileys of the whatsapp is far better than all the stickers available on other apps. its annual subscription of rs 55 is also omitted for the Indians and its nearly free for all of us. its fast simple and easy and do not lag that much. nearly whole of the net connected population of India is using whatsapp now. highly recommendable for all of you.