Judah

In my opinion it's the first of these that leads to their downfall, their backtesting is not realistic, they look at the start and end of the trade without looking at what happens in the middle. Their sample data is too small and they focus solely on trying to make their system work rather than trying to break it.

As a trader when i know that the specific currency behavior and my prediction still goes in right direction but i can be confuse about the trade and i do not put the trade but the results tends the my good prediction so this is a big drawback and lack of the decision power.