In my opinion (not allowed to post a video: youtube dot com/watch?v=JE1UBfMOmmw) takes a fair and objective look at BB tubes.
Two main points that I take away:
No auto gain reduction for when saturation settings result in louder output
Oversampling beyond x2 is broken and Waves is aware of this
I love the idea of driving even harmonics into odd harmonics and I think that if the above two issues were addressed this could be a staple plugin in people’s workflows. It’s an intuitive idea and the lack of gain compensation falls into the trope of “louder is better” when I don’t think that was the goal of the plugin in the first place.