I am using Aircel only because I did a mistake of choosing Aircel in Mumbai.
I got the sum in my collge itself with just the xerox of my college ID card.
Though the network is quite good in most of the areas.
But comparing Aircel with its competitors Airtel, Vodafone, trust me Aircel stands nowhere.
Because I dont travel much, aircel is okay for me, but seriously I wont recommend this network operator in Mumbai.