I just bought these a few days ago. I've had them playing solid for at least two of those days and there is unquestionably an improvement in SQ. They just came to life.
I will say that these having recessed mids is an understatement. They are WAY recessed compared to the bass and treble. I'm hoping that further burn-in improves this.
Sibilance is also a legitimate concern but for electronic and dub it's no big deal. It's annoying when listening to Adele though.