I have been using Airtel Broadband for almost 2 years. So far it has been a really good service.
*Getting the connection*
There was an option to register Mobile number/ email for getting a new connection. I gave the details and nothing happened for 1 week. Then I contacted a local Airtel agent, and he completed the formalities and gave the connection within two days.
The online application didnt work for me and they contacted only after 1 month for checking about my requirements.
The wiring and equipments(beetel modem and a really nice phone with clip/speaker phone facility). The phone has a slot where we in insert the GSM sim and copy contacts directly. I had to change the modem settings to make it compatible with my wireless router.
*Speed and connectivity.*
I never had any problem with speed or connectivity. It has been a really nice experience - so far.
One I had a problem with the connection and had to make a complaint. The service man came the very next day a did the necessary things.( their line got cut somewhere in the neighborhood). They verified everything is working fine before they leave. Also I received a call from CS to check if everything is okay.
I never had a problem with speed. I have a 385 KiloBits/Second connection and I normally get that speed. I watch a lot of videos and movies and I never had a problem with in it. I am getting whatever speed they had promised
*Customer Service and response*
Customer service is also good. I had kept my service in safe-custody for about three months and I could do that at home. I never had to go to their office to get things done. CS is fast, reliable, and user friendly.
*Phone Service*
I am not using the phone at all. I used to get some Ads in the phone, but after registering for the do not disturb list in airtel website I didnt get any such calls. I cannot comment on the call price as I am not using this facility. But the set they have given is one of the best available in the market.
*Others.*
The cost is in the same band when compared with other private connections, but higher compared to BSNL.
Based on all these experience I would say its a really good internet connection.