That thing is interesting for sure! I would like to know cost and of course the thought of it turning in my hands was a concern, But looks like it works well...
Then my second thought, being i was raised in mountains of NC was I wonder how it would react in Locust or Oak?
I know for a fact this works and works well...
https://www.chopper1axe.com/index.php
The one we have has a Fiberglas handle instead of the wooden handle.
Swung one of these way to much after school to think about... But it beat an sledge and wedge all day long.. kept sharp it was unstoppable!