I used it for 5 months and then I was compelled to stop it. Initially it was giving very good speed in Bangalore so that I could watch youtube hd videos without buffering. After 3 months of usage they reduced the speed. When I called them they told network problem and it will be solved within one week. But the problem continued after two months even.
So I stopped using it. MTS is far better option over Airtel 3g data card.