I opted for Iqara broadband almost 3 months ago. I have both Windows NT and XP.
Iqara works great with XP, the downloading speed is very fast and the connectivity is good. But if you have an NT OS I would suggest not to go for Iqara since the connectivity is slow. Moreover, you will not be able to login to sites like ICICI, UTI etc, ie, bank sites. Even e-mail websites cannot be opened properly. But if your OS is not NT, then I would strongly suggest you to go for Iqara.
The unlimited package is the best one. I am currently using the 225 MB package which costs 550/-, but ideally the Unlimted package is the best which costs around 800/- per month. You can even renew your account online with a 5% discount using credit card or netbanking of specified banks. The technical support of the Iqara team is also good.