Using the MT4 for charting for long. They are reliable & fast and LIVE, enough to match NEST/NOW live watch.
I am trading CrudeOil, Nifty/Bank Nifty Future using MT4. Stock futures data also very accurate and fast.
Most MT4 data vendors use REALTIME SERVERS like Trdadize and HouseOfBorse.
Currently, thousands of traders using MT4 servers for chartings.
Don't listen to anyone, just ask for a demo to test Nifty/BankNifty Future data with Live market to find the truth!
There are many reliable providers.
I m currently using,
http://mt4datafeed.in/mt4.php
cheap and reliable enough for trading Bank Nifty Futures with huge volumes.
Test 1 day demo, match Nifty Future quote with Nest or Now. Exact match and faster than web terminals like KITE etc.
Note: Sometimes, Options data may be incomplete but no problem with future data.
My old provider was below, good enough but little costly than above.
http://finmas.in/mt4/
There are many new providers, like Impulse Techincal etc who are providing MT4 for thousands of traders.
I request don't create a false impression with MT4 data. I love MT4. A lot of traders in Tj also using MT4.