There are a lot of wireless internet options available in India and out of those I have tried three of them till date. The first one I used was airtel data card and I really strugled sending e-mails with little or no attachments and even encrypted pages like paypal and some others never opened for some reason or if they did open I was never able to log in due to connection timing out every time due to slow connection. The second one was tata indicom which really did my head in and I dont even like to talk about it any more.
Reliance data card is what I have got last week and I am happy with the speed and quality of the connection. I have never got discnnected in the last one week and at times I have worked on my laptop for more then 6 hours at one go without getting disconnected even once which is just great as compared to other competitors servics I have used in the past.
I would say reliance data card just rocks 
