I am using Uninor since 2 years and I am not very happy. Firstly, while making any call they play an advertisement which is very frustrating when the call is urgent. Even when someone calls you they need to listen to the advertisement and then the call gets connected.
The net recharges are not good. The range limit is bad too. You will get the range only in few places. They have good offers for uninor to uninor customers but not for other operators.