They are all flawed, they are only as good as their ratings. That is why I use a bunch of them and go with what the majority find. Last year a majority of reputable SOS metrics said Iowa had a tougher SOS, and Sagarin was a crazy bad outlier compared to most. That was mostly due to the fact that Sagarin completely overrated several Big12 teams. And we both know they were crazy overrated, because they weren't even close to what we both use, the AP poll. That is crazy saying the #25 team is #15, and a team who didn't eve receive a top 25 AP vote was #22. That is just horribly bad.