Using MTS postpaid m-blaze since 1 year. Commonly facing the problem of speed variation. Data limit is OK.
Customer service is not to fast.
You complain today and they will respond to it after 2 days. Overall in some areas you can get very good speed while in some areas speed is like 2G connection.
So I prefer Reliance over MTS. Its speed is good in comparison to MTS. For MTS I think they have to improve their service and quality.