I am very satisfied with whatsapp application. Very easy to use even my grandfather use very well. It become part of my life.
Whenever I woke up in the morning first thing to check all the messages from my friends, boss and coworkers. Now I can attach pdf files too that is very nice feature. I can share my moments with friends.
I can even share my location too. I can share music and all. Whatsapp is very light application for any android or ios I know so far.