I just like to update as well, just today started trading with RK Global ODIN and very much satisfied with their support on installation of ODIN on my laptop.
ODIN gets frozen 3-4 times, while in Sharekhan's Tradetiger also frozen like this and annoying thing with tradetiger is when connection is dropped, have to close the application and enter the login again and again, where ODIN has the reconnect facility without getting logout.
Orders executed at lighting speed as well, funds transfer is fast (HDFC) and so for, I am overall satisfied with RK Global with very low brokerage on options (Rs.9/lot) where sharekhan charges high (Rs.70/lot)
I use quotetracker for charting..
This is just one day experience, let us see few more days..