Hi gabiscriba,
Petko uses the FTMO FREE demo account to test the robots before he uses them on a funded account. He has had a lot of success doing this. He has also used the results of testing on the FTMO demo account to use the robots with other prop firms and he has had success do that as well. This is the strategy he uses to tests the robots and has had success in passing challenges on FTMO and other prop firms. Infact, he suggests using the results of the FTMO app for deciding which robots to use on the FTMO challenge as well as using them with other prop firms.
I, on the other hand, use a different strategy. Both strategies seem to work.
Alan,