Ninja Simulator: what probability law do they use ?

I have looked at their simulator a little bit, what probability law do they use ?

Did you try it and is it realistic ?
 
Quote from rolextrader:

It's a good simulator if set to partial fills. Most of the time price will have to trade through your limit which is realistic.

Have you used it for stocks? If so which datafeed have you used thanks.
 
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