100+ hours of normal listening and a few nights with one album on repeat, but really cannot say they changed. With paper + DAC/amp + EQ they are fine, but my HE-400i are on the way and I will use these for gaming beacause of their soundstage.
Yeah I didn't bother doing burn in. I will use these as portable home listening and some gaming on my other gaming PC and ps4. They're so easy to drive, why not. I use Sennheiser HD598SE on my main gaming PC connected to Dragonfly black, playing BF1. These headphones never move.