So far the biggest mistakes I have seen with ORRez is the breeze and course selection. I am not sure if the RC picks the breeze and course or the scorer picks the breeze and course. You talk to the RC and get one answer after the race and then it is scored differently. Those are the only problems I have run into with ORRez. It is your typical sailboat rating system. Sometimes the water is clear and sometimes a bit muddy. Right now based on recent Challenge Cup participation the water looks very muddy.