I have to say I installed and uninstalled within 24 hours.
Reasons are
- Out of all my phonebook and facebook I had only one contact
- It seemed to eat my battery when not in use
- The font in the input text window was far to small.
The battery was the main reason however for me, as I am out of the house for nearly 8 hours a day I don't want my phone to be dead within 6 hours, and only for one contact.
I did like the speed however when communicating with my friend which was an improvement on my Whatsapp speed and the overall look is nice a clean too.
I uninstalled with the thought of returning in 6 months to see how I feel about it.