Well, I received mine last week on the monster refurb deal. To say the least, I don't like them. They may sound good with a poorly recorded 70 year old jazz recording but sound horrible with any type of modern music that I've tried. For comparison my full size cans are AKG-701s and these are no where near in their league. The bass is way overdone which makes the rest of the music range cloudy. I'm driving them with a Fiio E7, could that be the culprit? Or maybe they need burned in? I figured since they were refurbished that wouldn't be necessary.
I think the culprit would be the ear tips and how these fit on you, not the e7, although if you are using the e7 make sure you don't use any additional bass boost settings as the MDTs don't need it.