Well. I bit a month or so ago on the hype.For $120.
The 'good news' is they sound enjoyable to me without EQ. The bad news is: I find them hot and uncomfortable after 2 hours. I have relegated them to car passenger duty.
I far, far prefer my new $150 HE400se with $110 Qudelix 5k for PEQ, and Balanced Cable. Only PEQ needed is a Low Shelf of 4db at 80hz, and a Peak Boost of 3db at 2k. Supremely comfortable.
See GRAS FR and Distortion graphs here (HE-x4 and HE400se):
https://forum.headphones.com/t/drop-x-hifiman-he-x4/12561
If you don't need closed back, go with the HE400se and Qudelix if you can afford it.