I asked the Airtel guys if they can give me a demo of their 4G and 3G data card connections at my place and they gave.4G was mind blowing, it downloaded a 8-- Mb movie in 5min 45 secs, but it was expensive.
3G was a little slower than 4g, obviously, but I was getting ~700 Kbs of download speed. So I went for it.
And I dont regret my decision. Earlier I was using MTS, which was paaathetiiiic. Bu twith Airtel , it is very easy and fast to browse.