I am using mobile since 2007. That time I took the idea connection but due to its low call qualiyy and certain call drops, I changed my mobile operator in march 2008. Since then I am using airtel and I Didnot find any issue.
I chose AIRTEL over other network because my family members were using airtel that time and told me to opt for airtel as they even didnot face any problem with airtel.
I like the airtel as the quality of sound quality( call quality) in airtel is so good as I feel I am standing very near to the person with whom I am talking.
Their data services are so good that I Never faced any problem while using airtel data services since 2008.
One thing I dislike about airtel is sometimes it feels they are charging more for their services but all these things can be understood as they are providing better services also.
For me I have never faced any dispute with airtel. My overall experience with airtel is very good.