I have not. The AD2000 were recommended to me by the author of the review I linked, many years ago when I was looking for a metal headphone.Have you listened to R70x too? Any thoughts on comparison?
At that point in time I had tried Beyer T1, Beyer DT770, HE500, LCD-2.1, Alessandro MS1. The AD2000 took the prize.
It has forward mids and lightning fast speed. The sound signature is dry. Asr, the author, preferred it on an original Gilmore Lite. I tried the GLM2 and found that amp to be too neutral for the AD2000. It really came into its own when I paired it up with an Audio GD R2R-11, which gave the AD2000s a dose of warmth it needed IMO.
The only other headphone that ive heard that does what the 2000s do are the AKG K240 sextett, which IMO are even better for metal than the Ad2000s are. I havent suggested it to you because of its quite intense amping requirements.