amazing headphones, with amazing sound!
not cheap but this is as good as it gets! can work great on the iphone, AMP tends to make the bass more full and rich, but you can run then unamp (not reaching the full potential)

overall really amazing headphones, makes you cry when you listen to tunes. really really details and make the listening and music experience something you have never felt before
in my country it was expenssive, but in US its very cheap over amazon ! you cant go wrong 1!!