There was an oil filter study on the internet. It was a different oil filter study then the one most people talk about.
Anyway, according to some testing that was done in Europe, the Champ oil filter ranked the best. I believe that oil filters for Toyota vehicles were being tested, and according to the European study (and that study is dated now), Toyota's own oil filter looked worse. The FRAM oil filter that was tested was actually considered passable and actually scored higher than some other oil filter brands.