I have used idea sim and I can say that its good in all terms exccept in offers . The idea network is very large like bsnl and services are also very good. But the main problem is with its offers.call rate , msg rates , and data packs. There are not more options to choose offers.
Otherwise it is better than another operator. Voice quality , call drops are less than others in idea network.but if we use any tariff the charges are more than others. If offers and charges of offers comes than no one is the better than idea.