I can definitely vouch for this product.
The Bowers & Wilkins P5 is most assuredly one of the best "mobile" headphones designed for daily use.
And by daily use, I mean an over-ear headphone meant for on-the-go purpose and nothing else.
I too, was on the look-out for the best portable head-phones and having had the Dre Beats Solo, Beats MIXR (David Guetta Edition),Beats Pro, SMS Audio's STREET head sets I felt something was lacking.
Don't get me wrong, they are all good but to me they just weren't good enough (most of the times with an exaggerated bass).
I was happy switching between them until I got the iPhone 5 (now replaced by the iPhone 5S) and that is when I decided to find myself a good set which could give me a rich immersive experience.
These headphones (P5) aren't cheap, but I can definitely say that they are well built and they do offer an unique design which is then translated into a rewarding experience.
Simply put, it has a rich and well-balanced sound.
You can google it out and you'd find loads of reviews for it.
One beautiful review of this headset is by Tyll Hertsens and you can read that on here.
http://www.innerfidelity.com/content...adphoneheadset
And finally I have to say this and I will stress on it; At the end of the day you have to choose what is best for you and not what others say.
This is a subjective opinion, and, like the saying goes 'One man's meat is another man's poison', everyone will have their opinions.
Some will agree with me, while some will not by recommending something else.
The point is that you should walk into a store and try them out. Let your ears be the judge of what you want and seek.
And when you do, you will find yourself the answers to your questions.
Peace.