I, myself using idea 4g as one of my two sims from two years . In urban areas it goes fluently and very less chances of bad network. Sound quality is great also. And almost no cross connections during calls. But I felt, the connection is worst at rural areas.even sometimes no network at all. So I recommend it only when you are living in urban areas. Otherwise not. And always have an alternative sim for emergency. And also recharges are also almost of same price as others.
Not so good network overall.