Hehe, reminds me of the incident when I stirred up things a bit at Doom9. Sir Didymus was about to do a test whether the number of passes changes the quality in any way. I asked him to test OPV as well, which he agreed to do.
There were several members who just started bashing the idea that OPV offers quality at least equal to multiple VBR passes (of course, their opinions based on the CCE manual and basic mind games) -- till SD published the results and pointed out that he couldn't tell any difference between any of the samples

It didn't take very long for jdobbs to start tweaking the OPV prediction code in DVD-Rebuilder so I guess I did something useful