I find all other software products currently used by others broker's, SK TT, etc of no use to me because I use Amibroker for my technical analysis, scanning stocks etc. In fact I feel I got one of the the best deals when I started with Zerodha, with their low brokerage (0.01 for EQ), margin exposure for EQ and their NOW software (none of the other brokerages till date were/are giving a platform with such frequent ticks, and which allow data to be transferred to AB in realtime, which is what I badly wanted and had been waiting for for a very long time. (And believe me, data matters a lot, cause I get very different results when I backtest with SK data and NOW data. SK data misses a lot of ticks). RKSV also has a similar kind of setup (software) and in my opinion has a better brokerage plan, but what makes me stick to Zerodha and not shift to RKSV is their margin exposure (5x for RKSV, and 5-10x for Zerodha). So, to tell you the truth, I really got everything that I dreamed about (Brokerage,software, margin) with Zerodha and of course the 60 day challenge is an added plus point and I hope they do continue it.