Well I think I abused BSNL much with 2g-3g trick. I bought 2 dongles & 2 antennas for that and used to get 300-350+kBps & 200+kBps speed(other low due to interference). I had bought 2 TB HDD(I already had 1 TB which got filled). I have downloaded 40 GB in one day (and out of that 36 GB from rapidshare alone), avg was 30GB+/day. I took screen shot of that but it got deleted when my HDD went kaput. And I deserve that because BSNL also abused me much before that.
After sometime like 2 months, I didnt have anything left to download according to my choice. Now I dont like downloading 24*7 even if I get similar speed like @cisco_teck or you can say I hardly download anything (maybe 1hr when required) or just watch youtube videos. My daily usage even doesn't cross 1GB/day.
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I can tell u why, it's not because of particular data cards rather its the build quality of the data card. I feel modems available with BSNL EVDO is not good as compared to Sierra/Novatel/Huawei. I have used both ZTE AC8700 and Sierra, And now I can tell the difference. The available bsnl evdo device will work best with full singal strength and less users and then I think both Sierra or BSNL device will work alike(we have seen here that Prithvi modems also get 350-370kBps speed).
Im more curious to know difference between Sierra 595U and Sierra 598U.