Advantage :RK GLOBAL is the best my dear friends, i have account with them. Best brokerage and best trading platform, prompt payout. their ODIN software is really good. perfect brokerage and billing.
Disadvantage : incase u have any problem in placing orders, back office or technical problems etc... you need to call delhi office each and everytime , but back office and tech team are really good. no need to pay rs 100 or 200 to icici or anyother broker. they are just charging rs9 total comes to not more than 21rs including of taxes for option trading per lot.