Not doubt Tata Docomo provides service in reasonable price but the service is not at all good. During college time I was using this for some months and for that I have to face many problems . Net connectivity is too slow . 2G is extremely slow . The network is not available even if in same cities . Only showing attractive offers they are trying to sell product but the most important thing which is network connectivity which is not available.
From my experience I will never recommend this to anyone rather go for bsnl .