Disclaimer: These headphones were sent to me thanks to the Oppo loaner program. They have since been returned and sent to the next reviewer.     Want a headphone that sounds excellent, is easy to drive, and can be transported easily and taken on the go? Look no further than the PM-1!     Build Quality: Since I am participating in the PM-1 loaner program I should expect the PM-1's to be worn out from dozens of headfiers listening and reviewing them. Upon inspection the unit was obviously worn out; but you know what? It doesn't matter! The fact...