Aircel is very good mobile network in main cities but in the rural areas the signals drops off. Even sometimes, in the cities the signals drops off suddenly.
No doubt in terms of plans, its the best one can get but whats the use when signals are not good. 3g plans and rate cutters offers are very good. 3G speed is not so appreciable. So basically one can get Aircel sim when he is residing in city and can get another sim like Airtel, vodafone or idea for good signals as most of the phones now support dual sim.