I still think there are at least 2 "versions" of the MH1. I can't understand when people say their MH1 have a muffled sound/poor highs/excessive bass. Mine are very balanced (no gobs of bass as some have reported), with a crisp top-end which is brighter than my RE-272, and almost as bright as my Rock-IT R-50. Also, the detail retrieval on my MH1 is almost on par with the R-50, with an even better spatial positioning and a wider soundstage (no kidding).
I don't think they are muffled but I also feel they are not as detailed (ability to separate multiple high feq instruments) like my re0 nor are they as bright as my GR02 BE so in all I think they lack a little of the crispness at the high end.