All the time. There isn't anything I don't like, rather areas I'd like to improve upon. I have the Stellia and Susvara at the moment and really enjoy listening to both of them but going back and forth makes me miss certain aspects of the other headphone. On the Stellia I miss the openess/spaciousness and detail level of the Susvara and on the Susvara I miss the bass impact/dynamics and, I don't even know the word, "euphanism?" of the Stellia. On the tube amp the tonality is just perfect to my ears. I've yet to hear a better headphone for techno and synthwave on Stellia but Susvara is better for EDM/Trance and Pop. However, I spent 80% of the time listening to Techno and synthwave so.... I guess my "perfect" headphone would be a combination of Stellia and Susvara. So basically I want to improve upon the stage/detail of Stellia and I guess dynamics/bass impact on the Susvara then both of those would be perfect. I am a bass head so I already EQ on the Susvara's bass like crazy, I got the Baxandall EQ on Manley amp turned up like 80% but it still doesn't quite have that slam quality, it's very close tho.
I've considered trying the 1266 because from impressions they seem to have the bass/soundstage I am looking for but the opposite presentation. I like a smooth, easy going and laid back listening where I can "look forward" into the music rather than it shoved down my throat.