The deal is not so sweet from my point of view.
If I opt for the offer, Rs. 200 will be added for next 5 bills = Rs. 1000
Data will be consumed faster at 40mbps and no extra data given by Airtel, so plan also needs an upgrade = Rs. 200 or 300 per month depending on new suitable plan
I asked Airtel to cover cover at least one of the above costs, which they refused but said they will add it as consumer feedback.
P.S.: I inquired about upload speed. They said - "as per standard it should be 1/8 of download speed, i.e. 4 to 5 mbps". Never knew that standard.