Yeah, I like FAM more. I'm not a pro, but FAM just seems more exact... From what I get, it marks O once there are 3 temps higher than the previous 6. On the advanced method, the only thing it really says is it "uses the computing power of our servers and various chart patterns in our system" or something to that effect... I don't know, advanced just seems too vague about how they calculate O. I usually just switch back and forth to see if there are any differences in the interpretation. Oh, and Research is only for VIPs, so I've never tried that one, and I don't do opks, ferning, etc. so I've never tried that method either.