I am customer of reliance gsm network from last three years and I regularly use internet on reliance. Earlier I was using 2g net due to unavailability of 3g option. When they launched 3g I thought of using 3g but I fined fluctuation in network while using 3g.
You can enjoy the 3G when you stuck at a single place instead of traveling time. Even 2G works fine in reliance. And now finally I am using 2G plan. I think they should improve their network