3 years since I used this headset.
careful it does not serve to make the monitoring of your prod.
Indeed its not neutral uncomfortable (although super light), and must be tinkering to keep it long time.
Anyway it is very firm and I use for decision without repisse voi.
The reference pro is in my opinion abusive as that of monitoring.
I m not use it on an mp3 player because the impedance is too high result the sound is too low!
before my purchase I did not know the criteria.
in fact it ALWAYS test its monitoring headphones without financial commitment!
j saves with experience to take a more expensive model.