I had the two 6awg 20a circuits installed today with the 65aic 20a breakers. I can say that they are heavier and the switch has a harder, solid snap compared to the normal 10aic 20a breaker of the same brand. They also take 6awg wire, which the 10aic did not.
Here’s the main panel with the EP2050 and EP2750s installed.
Unfortunately, I can’t speak to how these sound yet because one of my BHK300s is in Boulder.