Exactly my point. He only tested the op amps for their low-noise performance, and then went on a long diatribe about A-B testing blah-blah. That is why he even called his amp the "Objective" as to not insinuate any subjectiveness that is I guess is "hogwash" to the designer. I think many have shied away from op amp rolling in the O2 due to these reasons- thus the reason for all my research. It seems to be a very popular amp, yet the op amps are just "meh" sounding. I also read something this week about dual channel op amps and most of them designed for differential purposes and I think singles are probably much better for audio, even if carrying the same signal, like in the O2 design.