consider these headphones in the same class and price range as the HD 25 ii. The packaging, hard case, high quality 1/4" adaptor, 2x Kevlar covered Cables, and headphones are all top-notch and appear very durable befitting their mil-spec rating. I have ~50 hours on them and they are still sounding better with use. I'm guessing that they will pretty much peak within the next 25-50 hours. I'm really liking these so far as an office/portable set to have in my work backpack.  Not unexpectedly they have a forward sound signature that is smooth, lush...

I have been researching a more potent amp for my desktop system and all I have to say is Wow! I just plugged the MX1 into my office system for the first time and I am very impressed. The amp section is robust enough to drive my HD650 in a similar (not quite as refined) fashion as my Schiit Lyr in my main system. Great extension in the bass with solid mid, airy and extended top end indicating a respectable DAC stage to go with the powerful amp. And I can easily switch between HP and desktop speaker out with the RCA line out on the back panel. Overall...