If you know nothing about Audeze, here's the tl;dr: They make some of the best headphones in the world.
If you want to start with a good review of their older flagship, here's a good video to checkout:
Thier revolutionary acoustic engineering and beautiful craftsmanship makes them an irreplaceable tool for those requiring the most transparent audio reproduction available.
Audeze's audio tech explained
The tech and audio quality aside, even the wooden rings of their flagship headphones are crafted with extreme care.