My experience with it so far

On the usability side
- Push notification works well so far
- If the app is in the background, it will always show "Searching for data connection" , however, it connects once a message is received
- Battery consumption is an issue if the app is kept running in background (could be related to the constant "searching for data connection")
- A bit slow to start up and lags occasionally

needed features
- Group chat
- Data sharing (image, sound, location...etc)
- Message indicator for LPM