HiFiMAN's first orthodynamic and full-sized headphone model.
I'm aware that it can take 24 hours or so for the moving parts in a phone to calm down, sometimes a little longer. It's the hundreds of hours claim which lead to people waiting till a month of listening to judge their phones/amp etc.
It's a very convenient claim for manufacturers isn't it? That's about the length of time it takes
the human mind to get used to something it doesn't like at first and come to see it as normal.