I have been using Market-Data-Provider (MDP) Tick-By-Tick data for more then one & half year in NSE Cash, NSE FnO, & MCX in exploration mode.
google U will find the website..
Its wonderful and cost-wise very cheap too in comparison to peers.
The Exe file to bring in RT Data is very small and updates automatically.
In nut shell it has been trouble free all the subscription period till now, rarely require support help which is available 24x7.
More amazing thing they do on Christmas/ new year that they bring in some offer like 1+1 bonus (last time they did so) etc.
So the effective subscription becomes half ....
Annual mode of subscription is very cost effective.