Rating: 
Summary: Worthy successor to the PD 100
Review: I've had a pair of Sennheiser PD 100 mini headphones for about 15 years now. That's a long time for any headphones, but particularly for such a slim, lightweight pair. It seems that manufacterers gave up on this style of very lightweight for most of the 90s. As my PD 100s finally started to develop cable problems I was very glad to find that Sennheiser had come back to the concept and even improved upon it! Koss Porta-Pros have been available all the while but I don't find them as comfortable and don't like the punched up bass.The PX 100 sound even better than the PD 100s, feel great, cost less and fold down to a convenient size. I like the hard sided carry case. The PX 200 are sealed, but I think an open headphone works better for this size and is certainly more comfortable. I even prefer these to the HD 497s. Note that these come with a mini plug so you'll have to supply your own adapter if you want to plug into something with a full sized jack. I like that I can use these with my iPod Mini without having to use any of the EQ curves (which drain the battery faster). These things are a dream: light weight, comfortable, great sound, portable and cheap! If these turn out to be even half as durable as the PD 100s then Sennheiser has a real winner on its hands. I don't think anything else can touch these at this price.
Rating:
Summary: Perfect for the iPod
Review: I've had an iPod for over a year now, and have been content with the included earbuds. However, I recently visited my local Apple store and listened to one of their demo iPods through an expensive set of Bose headphones. I realized there was a *lot* I was missing. I decided it was time to upgrade the earbuds, but on a limited buget. Furthermore, I didn't want huge, over the ear headphones for a portable player. After doing a bit of reading and looking at reviews, I decided on the PX 100's. These headphones, for the price, are as good as the reviews indicate. The sound is incredible, and the bass (without EQ enhancement) is unbelievably deep. While I still may use the earbuds when I want to block out surrounding sounds (or not have others hear what I'm lisening too when the volume is up), these are a great everyday headphone for portables.
Rating: 
Summary: Rattling sounds
Review: I've had these headphones for about 4 to 5 months, and over that time, they've started to make a nasty rattling sound. It mostly happens during parts with boomy bass, but it's been happening more and more for a month or so, and now it sounds terrible. I thought that I had a defective pair, but the same thing has happened to my brother's pair of PX100's, too. The quality was incredible, but it's not worth having a rattling sound in the background most of the time.
Rating:
Summary: Probably the cheapest real headphones
Review: If you're looking for accurate music reproduction these are probably the cheapest good headphones you can get. They hold their own against much more expensive ones, both from Sennheiser and other brands (I also own a Sennheiser HD580 and have used several others). Ergonomics are excellent as well, I can wear them morning through evening without "ear burn". Much recommended!
Rating:
Summary: Gorgeous
Review: It's hard to believe that headphones this small and light can produce such wonderful sound, especially from a portable player. I'm hearing things in my music that I've never noticed before. And folding them up to store them is really easy, except, who would ever want to put them away!
Rating:
Summary: Simply put, the best headphones under $50
Review: One of the keys to buying a good pair of headphones for your player is "impedance matching" . The Sennheiser PX100 is a perfect match to my Iriver H320 at 32 Ohms (BTW, if you're shopping for a quality MP3 player, the H320 blows the iPod out of the water!). With a perfect match, no sound quality will be lost from the device to these headphones.
Simply put, the PX100 are the best headphones you can get under $50 and if you're looking for something more high-end, the Grado SR60 (also at 32 Ohms) are the best cans for under $100 period!
Rating: 
Summary: Good headphones w/ a couple "buts"
Review: Overall very decent headphones for the money. There are a few things to consider however :
1. There's no gold plated connector, which I would have expected from Sennheiser.
2. The cables, seem a bit, well... thin. It seems that they are sturdy, but still, it feels like if you were to pull away too quickly from the audio jack on a laptop with your head (out of range of the cord) that you might break the cord.
3. They seem a tad flimsy, even though they wear very well... Here appearances can be decieving.
4. They need wear-in time. At first I swore they were no better than my Radio-Shack 12 dollar headphones. After a few hours, they warmed up and have been good ever since.
5. They're slightly externally noisy if you're listening at loud volumes.
6. They're not made to filter external sounds, and they dont do so very well... these dont pretend to be noise canceling headphones, and they certaintly arnt.
7. Make sure you wear them the right way (R on the right, etc). Sounds stupid but it's sorta easy to put them on the wrong way and conclude that they dont wear well. Now for the good: 1. Audio quality is warm but sharp.
2. Bass reproduction is pretty faithfull, especially for a pair of headphones.
3. The carrying case is pretty sturdy. Something i'd put in my backpack with the 3 tons of books I carry daily and not worry about crushing the headphones.
4. Power requirements are pretty light, they wont suck the life out of your iPod/laptop (I'm assuming that if you want your hands on these headphones that you also have enough taste to have the best MP3 player out there :) )
5. The overall solidness of the construction is comforting. Quality workmanship.
Rating:
Summary: Not 40 dollar headphones
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!
Rating:
Summary: Awesome!
Review: These are some of the best headphones I've ever seen (or heard) for under fifty bucks. Excellent bass, mid-range, and high response. A must have accessory for every iPod!
Rating:
Summary: Excellent portable headphones
Review: These chinese headphones are a great buy.
I use them to learn swedish with a portable cassette player. The quality of the sound is clear and crisp. These headphones make my learning time a pleasure.
I really recommend them to anyone looking for low price and high quality headhphones.
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