Powerful sound, comfortable to wear and .........

...... The price / performance ratio can hardly be beat.
Crystal-clear, voluminous sound, even at extreme volume brings no loss ("shout") with itself.
I use the On - Ears on a Philips SA4MUS08KF / 12 GoGear Muse MP4 player and am absolutely thrilled. So you do not have forcibly an Apple product (awakens the packaging so the appearance / Quote: Made for iPod, iPhone & iPad), to use this Logitech may, but simply dispose of the jack corresponding thereto. The comfort is also second to none. Even with a very long useful life, they are not uncomfortable, press on the ears yet they act otherwise disturbing.
Maybe a little tip. I wondered when you connect that to me every time the plug (on the handset) slips out of the socket at the slightest movement, and I was only sonicated unilaterally. The plug must be plugged into my eyes with quite a lot of power is perceived to strong click. I also the 6000 Over - Ear use and there had the same problem, I thought of a manufacturing defect.

Conclusion: I have finally On - Ear found that satisfies me completely technically sound. The optics with the blue cable may take some getting used and not for everyone, but should not ultimately be buying decision. I think that we have arrived in the price range with the UE4000 at the upper limit of what is feasible at present. Clear 5 stars and a full purchase recommendation!