@mapman "Have heard Zu Essence I believe several times at shows and never quite floated my boat so far. Might try again."
I doubt a company does worse at showing their speakers off than Zu. At shows, they often come off as horrific, and leave so many wondering how they sell any product. And yet with that, the folks from the company exceed most any other.
In the effort to understand what drove all the fuss about the actual product, I've visited several people who had them in their homes. In a good setup, they can really shine. If I wanted to move on a pair, the Essence, Presence, and Definition most attract me.
Compared to the Zu, Heresy have a very different presentation. Yin and yang goes a bit too far, but few should have trouble deciding which they prefer. The differences are easy enough to understand. If at all possible, seek out what it requires to listen to each in your rig. I don't think you can go wrong either way, and both deliver excellent value