i have reliance data card.. it works fine.. although u get at max 1.5 mbps as against the promised 3.1 mbps.. so that not good..
also during peak hours u can't even give a normal gtalk phone call.. voice breaks.. so really bad speed as compared to what they promise.. their brochure says mini 256 kbps guaranteed.. i doubt if even that much we get sometimes..
but its just so that no other provider also is better with this.. i have used the data card in pune, delhi.. it works fine though..
in night after 12 you'll get seamless speed..
btw, check out the airtel data card
Devices
they must be much better..
also they have a plan coming where its 999 for unlimited data transfer.. i guess its really 'unlimited'..
its a 3g card and has a speed of 3.6 mbps..