I have been user of idea for almost 2 years and I m fully satisfied with the service. Talking about coverage it is too good.When you are out of balance you can avail loan service very easily.plus even if we chose 2g internet packs, the speed is really good.
I have put many 2g packs in vodafone and not being able to use atleast 100 mb of data because of slower internet. So as per me Idea is the best which can change your life