I have it and it works great. Before buying it I did test the results for Reliance and Vodafone via friends who bought it, but this works great. While leaving from office to home in my car I just connect the dongle and leave it. It works superbly and there are no disconnect as well. Because of travelling the network range fluctuates but it does not disconnect.
The wifi works great. You can just plug it to your power bank, your usb charger or laptop, it works perfect. Most important thing it works all over INDIA.