Onavo

Its a new data usage monitor developed by Onavo . It tracks the mobile data (both edge and 3g) being used by your phone, stores the information ,processes and displays it in various formats. It has many useful features including app-wise data  tracking, monitoring apps for extensive data consumption, providing you graphical analysis of data used and even suggests better data plans based on your usage.You can define your plan (monthly,yearly or daily) and even set alerts on limit of data usage.It also provides 3 widgets for the home screen including live data widget,app widget and data plan widget. Sadly it only tracks mobile data and not Wifi.

Performance :- Its provides very accurate information compared to other apps and load times are not even significant. The only thing is that you can only set the start date of your plan and end date is calculated accordingly without giving user the choice to set it.

User Interface :- It has a very elegant and subtle user interface supporting color changes according to the data usage.

Known Glitches and Bugs :- None

Navigation and Usage :- Navigation in this app is very easy and with the added functionality of widgets its easy to use too.

Addiction level :- Depends on your usage . If your are a frequent mobile data user than this app will be hard to uninstall.

You can download and install it from Here