I bought it for $50 and barely use it to be honest as you cannot use non-standard indicators with it like ND said. If you have a system that uses Stochastic or RSI etc.. then you're better off using this free expert advisor builder instead anyway. I would say that the only advantage that Gordago has over this free builder is that you can set different timeframes on the indicators. That's roughly it.
http://sufx.core.t3-ism.net/ExpertAdvisorBuilder/