I am using this app since many months. Its good app to check your account balance, make transaction like transferring funds from one account to other, do mobile recharge, request for services like check book. Passbook function is also good.
I find this app very useful. It has smooth and managed interface.
When you login in this app first time, an one time password will be required for confirmation which will be sent to your registered mobile number.
Note: - You should have net banking facility to youse this app.
Very secure app from a very secure bank.