Surprised to not see comments here about these phones now they're in people's hands. The thread at Head-fi has been blowing up with a fair bit of praise, comparing them to good wired sets like HD6xx and LCD2 classic... while not the greatest resource, it's not Macrumors
In any case, got mine today, surprisingly good, esp. after finding out that you can tweak the sound profile a bit in the accessibility section of iOS - Settings -> Accessibility -> Airpods -> Airpods Max -> Audio Accessibility Settings -> Headphone Accomodations.
I prefer Balanced Tone w/ Slight for the soft tones. It brings out a bit of extra presence over the default profile.
Crinnacle @ head-fi measured these and it appears Apple did try to target the Harman curve. An impressive amount of lower bass without a midbass hump.