Summary: A few weeks ago, I met a very nice gentleman who was a distributor of this product. I had never heard of PSB let alone the M4U 2 and I was given the opportunity to demo this product. A very big thanks to John of Lenbrook Asia for this opportunity.
On The Head
Isolation - average.
Pros: Noise Cancellation, Active, and still usable if batteries drain. Comes with lots of accessories
Summary: I've owned the Sennheiser Momentums, B&W P7's, and other mid-fi portable headphones but I prefer these in terms of sound quality only.
Why? These headphone's have such an organic/balanced representation of all the sound frequencies that it really sounds accurate/natural opposed to accurate/cold or...