I love this app.it is a great wonderful one, with no problems at all.
I am using whatsapp from last 2 years and I am really happy with this service, its help me to communicate with my friends.
And family members very much and will always wish to use this service there was always been problem with the desktop version.
But the updated version also has this feature by which we can synchronise our messages and the new calling feature is also a good feature whats app listens to their customers very well. I have tried many apps like viber, wechat, hike etc but of all I liked whatsapp the most