It's a decent operator a wide range of coverage on 2G & 3G but it's 4G network breaks down in some area's.
I am personally using this network from past 2 years & I am pretty disappointed with it's call rate, it's very expensive at 2p/sec & you have to use the rate cutter packs to lower down the call rate which sometimes are not worthy enough.
If they improve their 4G coverage & lower down the tariff then they will surely kick the hell out of that Silly & so called best network in the name of Airtel