Thankfully I’m pretty weight tolerant so I find it quite a bit comfier than HD 6X0, which has too shallow of pads, a stiff but smaller surface area headpad, and insufficient earcup rotation for my head.
Re: serviceability… perhaps it is that the bar is in hell. But also, HEDD isn’t that small. I’m reasonably confident that the same company that offers a 5-year warranty on their headphones (and has for a while, iirc) will be able to support this one… though they may end up selling more of these than they initially expected 
$800 seems about right given the difference I’m hearing and the fact that it’s more comfortable/premium feeling. Much worse headphones cost much, much more after all 