I was using tata docomo which was frustrating at times due to no coverage at many places. this made me to port to Idea, Network is awesome but if you compare with the prices its way costlier than Docomo. Docomo provide some 180 talk time with 1 Gb 3G at 250 Rs. where as in Idea you will end up paying 269 for 1 GB 3G data. Which is on higher side.
But its quality vs quantity.Docomo gives quality where as Idea gives quality. Idea is best suited for corporate who need best coverage.