People have bashed on them either way (especially when they came out against the Audeze Sines, which had a more "fun" sound) but I've enjoyed them and have experienced pre-recorded music in ways that only a top of the line Stax or Electrostatic headphones have outdone in spades.
They have one erratically, awful, humongous flaw: the material the earpads and headphones are made out of are terrible & I can't imagine how cheap even though replacements have cost me $40 each and I was dumb enough to have Oppo refurbish the headband for me. Let us review how my pair currently looks (as of a few hours ago):

Third pair of earpads and second headband, the material of which is so cheap that it has become paper thin and unseemly, best described as "ratty" and the white flakes are a normal detail of my shirts and even furniture I sit on. However, there is a solution! Throw money at them:

A company from Ukraine sells custom made leather earpads & bands for far less than I paid for my three sets from Oppo directly and after HapticAnimal bought a custom pair for her Audeze Sines, I decided to take the plunge because at this stage they're unusable (the padding is so awful that my ears smoosh into the actual underlying components and the feel that wearing them brings, pushes my head towards a migraine)
What I discovered upon contacting them, was that they provided properly dyed and furnished leather in multiple colors! After a bit of thought and sketching out ideas while so high I don't actually remember the day before and after brainstorming these, I decided on this color scheme / material:


"Of course Retro would buy the radioactive colors! Plus actually wear them in public..." is what you are surely thinking. However, these colors were picked AFTER seeing examples of the leather which do not correspond to the bright shades of insanity (sadly) that I've sketched above. With another two or three weeks until my order is complete and sent me way, I'm going to keep exactly how the leather looks a surprise as I'm sure it will delight even me.
Excelsior!