You can search for m2c reviews but these are based on not fully burnt-in ones, I had mine burned for 500 hours so far, compared to 1000 hour ok2, it sound much more realistic with much better extension on both ends, the sound stage is ridiculously vast and deep. The instrument placement is exquisite and completely layered. Listening to orchestral music makes me feel like to be a conductor. The bass while not thunderous like bassy iems, is deep, very tight and again just very very realistic for bass instruments. A new pair has no dynamics, no ambiance, bright highs (though not sibilant) and very forward mid which to hide most mid range instruments behind the vocal, after 500 hours the sound will be completely natural and EFFORTLESS. The vocal is more realistic than a 250 hour re252.
I will burn them in for another couple hundred and start a loaner program of some sort just so people can realize what they can get for $40.