Subhash, i myself use the product nd its the best wireless broadband device i have ever came across.
I run youtube videos without a buffer & get pleasure of live cricket matches even when i am not at home, through the photon tv application.
Upload & down load limits pop up in a window every half an hour ! so there is no point of me not knowing my usage( i shall suggest if you are confused with data based plans, switch to time based plans, at least you can very well track time)
Account balance can always be checked through call center, though i never felt calling because i knew my usage is under my GB limit (u dont need to take care of the gb's in the time based plans)
For all wise men " we have been using wireline broadband since ages ..& we very well know it!!
its always better to change with time & to try out something better because technology has evolved itself that way so take the advantage of it"