Airtel or Spectranet in Gurgaon??

Hi every one!!!
I am currently on Airtel on 1299 plan which becomes 1500 after taxes and also FUP is a mere 15 gigs which I consume in 2 weeks.
I was thinking of switching ISP's to spectranet. They have no FUP plans as per their website.....

I would be thankful if someone answers my questions....
1. Is no FUP a reality or a hidden marketing gimmick?
2. Is it worth switching or I should try airtel retention department for some good offers.....

Any view would be helpful.........Thanks in advance.

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Area?
Airtel has announced new plans, check their website.

go for spectra net if you have them in your area that is
airtel is a fucking piece of shit who keeps sucking your money

at least airtel provide stable connectivity. which cannot be said about most isps in this country.