I would concur so far from limited burn in and listening.
Funny, that description kind of fits my old AD2000's as well, but with a definite lack of bass quantity.
I have my eye on the AD2000x, if I can sell my older AD2000's then the updated version will be next.
Love those headphones, but always found them to be on the bass light side of things, but with great sound stage and detail, hoping that the 2000x handle the bass end with more quality bass.
Would be very curious to know how the higher end models compare to the AD900X's. I hope you will take one for the team here.