The P9 is a very weird headphone to me. On one side, you have people who literally hate it, and on the other, you have people like Convince me Audio, tons of reviewers, etc, who love it. Some people have made the argument audiophiles dislike it, but not in my experience.
I struggle to figure out why. One part of me wondered if there are fakes floating around, or if there were two production runs. No way would anyone call the pair I've got muddy, or say the treble is lacking. It is close in detail to my Focal Clear, and significantly above Bathys/PX8 for detail in the treble region. I also had p7w, and I can say with dead certainty the P9 is technically on another level, it's noticably more detailed and spacious in it's presentation.
P9 remains a bit of a mystery to me. I know three people who bought pairs and absolutely adored them.
I think everyone should give it a go once.