Well, to answer my own question, they sound great. Sonically worlds apart from my AT M50x’s. Smoother and overall less fatiguing when using for long periods of time. Much more comfortable (although i dont find the M50x to be uncomfortable as such).
Not so great with general music playback, as with any monitor type of headphone they can sound boring, but with my keyboard rig, and using a DAW they seem much more true to life. Ive mixed a couple of my old tracks and what i hear in these match my speakers and daily EarPods much more than with the M50x.