Awesome mids, no sub bass, polite but consistent treble (thanks to the titanuim coated driver I guess). I think it's a got excellent timbre but I cannot live without some form of sub bass and this just doesn't bring it at all.
But the imaging is fantastic thanks to the mids and treble finesse, it has this vintage headphone tonality to it, like my Senn HD540ii without any of the sibilance or sharpness. But also without even enough low end for dynamic driver standards imo.
It would make an excellent driver for a dual driver setup though, if one could source a bass driver and stick it in a dual driver shell
Also the shell has a unique fit, will work for some but not for others I'd imagine.