Bro, we can't expect a trial for 500/- pm data. They expect users to take trial for 1 month by paying 500/-. I use their data, its good. If u are intraday trader trading 1min or 5 min then u may find that the feed stops sometimes.
Only who is afaraid & knows that his service is not good will not offer trial & I doubt realastockdata.com is any gppd as they are sure once tried they wont get any subcriber.