The WP900 are the first cans I've worn much less owned in ~6 years. I am 100% about portable/transportable use, so my needs aren't the same as others who are after TOTL stuff, for the most part. I provide this context before saying: The WP900 have been somewhat of a revelation to me. I have never enjoyed headphones as much as I enjoy these; I have never owned hp's that I wanted on my head for hours on end.
These have totally changed my outlook on future purchases. I thought I was going to be in the land of IEM-only going forward. I'm glad my unwillingness to spend 100's of $ on Ch-fi IEMs took me in this rather unexpected direction very recently. I was away from the hobby for over 5 years until a few months ago, so my knowledge base is way lower than others 'round these parts. In this case, it helped me get to gear I otherwise would not have tried (even as someone who has always loved the aesthetics of AT woodies).