I used it a few years back. It was, and to the best of my knowledge is, the only sim flight planner that provided Equal Time Points based on various rules. I had trouble then finding information about how to make proper use of that, and other features. At that time the real world weather service was bought on a yearly subscription.My feeling is that FOC is rather good at trying to simulate a real world dispatch software. The documentation was then poor and did not cover everything that the program could do.Would I recommend it? I still use FSBuild, FOC has been long since shelved.