I've had the headphones for about a week now. I wanted to go with padded earphones rather than those that "cup" your ears.

Audio quality is excellent. They have ample/impressive bass for such flimsy looking headphones. I tried these with my iPod on the "Rock" EQ setting, listening to every genre: orchestral, electronic, acoustic, etcetera. Every track came through quite nicely. I'm not a hardcore audiophile, but I do like to hear my music clear and (sometimes) quite loud. So far these have delivered.

I mention that these are flimsy, but in a good way. The earphones are loosely attached to the main headband, which is flexible metal. They remind me of comfortable Plantronics headsets I have used in the past, so they don't "clamp" down on your head. They fit nice and snug.

The included case is a nice plus for travel - it took me a few moments to figure it out, but it comes in handy when toting the headphones from place to place.

So far I am very satisfied.

Awesome (Rating: 5.00)
Review : I read the reviews of these headphones and decided to go with them because my other headphones sucked. I was totally blown away with their sound, especially considering I spent $40 on them. The bass is just SO good. And they get really loud, at least with my iPod. The case they fold up into is very nice, it makes them very difficult to break. I would definitely go with these just for like listening to music around the place. They project a lot of the music into the atmosphere around you, so people nearby can hear the music, and that created issues when I tried to record with them, but they're not closed, so that was just a stupid idea anyway.

The BEST iPod headphones available! (Rating: 5.00)
Review : I'm really impressed by these phones. The highs, mids and bass are really clear, plus you can crank them and they won't distort. My iPod drives them very well.

I listen to a wide variety of music, from downtempo and psy-trance to 50's jazz and Baroque. Everything sounds good with these, but I might be inclined to back off the bass slightly when I'm listening to Handel.

They beat the pants off my Sony behind-the-neck headphones and my $80 Sony "bio-cellulose" earbud phones AND the iPod earbuds. Don't expect them to isolate you from outside sound, however. And in quiet surroundings people sitting near you will probably hear them too. But who cares?! Highly recommended.

My new favorite headphones (Rating: 4.00)
Review : I am a true audiophile so audio quality was of utmost importance, but I also wanted a smaller type of headphones since I don't like walking around in my Beyerdynmics or Grados... I am also wearing glasses so comfort is important. After several days of listening to the PX100 I must say that they satisfy all my requirements - incredible sound for the price and size, small and very comfortable, and even look good!
I give them 4 stars for two main reasons: 1) the connector is not gold plated - for Sennheiser I would expect this. And 2) the frequency response is not very flat (the lows are raised to high) so these will probably not sound very good unless you equalize, but most audio gadgets today have an equalizer.
Finally, a word of advice: don't judge these headphones as soon as you get them, let them burn in for several hours.

Not 40 dollar headphones (Rating: 5.00)
Review : The main drawback about buying a product like this on the 'Net is that you really, really, really want to be able to listen to them first. Yeah, these phones have gotten great reviews, but are they really that good? Since I can't let you listen to mine, all I can say is that if I had been able to listen to them first, I would have easily dropped $100 or more on these. I have a pair of Sony "Studio" phones that cost over twice what these do, and the sound horrible. The PX 100's have incredible frequency response, I can hear every note on the standup bass, all the way up to the screechy highs of the piccolo and trumpet. Incredibley light, the carrying case is well designed and the folding mechanism is intutive. My only complaint is the cord length: 1.4 meters, so a little over 4 feet is a bit too short for my tastes. But at about 40 bucks, you absolutely cannot go wrong. A resounding Five Stars!

Hardly know you have them on!! (Rating: 5.00)
Review : Very nice headset, hardly know they are on and yet the bass is very rich and soothing!! Nice!