Has anyone had any experience with “M12 switch IE Gold” ?

My local dealer in Michigan is bringing the M12 switch IE Gold Into the shop on Saturday for a listening session.

Anyone have any experience with this switch ? 
I read a darko review that was really positive. https://darko.audio/2018/03/for-the-audiophile-who-has-everything-telegartners-m12-switch-gold/m12-s...