I have been using Tata DoCoMo Broadband there hasnt been any problem so far with the connectivity but the problem is with their tariff cards, too high, service is good and prompt, and checked speed is upto mark, complaints are attended swiftly
Committed Speed quota and they provided the same, But I had to withdraw from them because their billing and keep on upgrading to higher plans with their call centre sales executives bugging you all the time.
I was using it at my store at Andheri in Mumbai,