Rating: 
Summary: Works in Iraq
Review: I'm a soldier and I have been using these headphones in Iraq in some pretty harsh conditions since May of 2003, and here it is almost a year later. I have used these earphones in C-130's, 5-Ton Trucks moving through the desert, and Hummers as well. They offer excellent sound insulating properties so that when the ambient noise around you is high the volume does not have to be loud to still enjoy your music... so my ears are not ringing when I take them off after having flown in aircraft and enjoyed my music on my Iriver mp3 player. They are pretty durrable as they have not failed me in this year either. The sound is great also, and the bass is right on top since it is sealed into your ear much like our foam hearing protection is. The replacement foam that comes with the headphones are an excellent touch, and KOSS has my business when it comes to finaly having to replace these headphones. They don't fall out of your ear when you are running PT either.
Rating: 
Summary: Very good for the price
Review: I bought these to replace the stock iPod earbuds because A) they sound very tinny B) the white wires just make you a walking Apple advertisement. The good: They blow the iPod earbuds out of the water 100 times over. The bass on these little guys is rich and the highs and mids are nice. These are obviously not for audiophiles, but for the price (I paid $10.99) they are absolutely worth it. The in-your-ear design had me hearing my music in a way I had not heard before. The bad: Like everyone is saying, they don't quite fit in you ear as advertised. Keep trying until you hit the sweet spot and keep them there. They may not be suitable for people jogging or working out because I would imagine they would lose their position often if you shuffle around a lot. So one point off for bad ergonomics, four points for great sound and value.
Rating:
Summary: Fantastic sound, deep bass, perfect fit
Review: I bought these to use with my iPod, and I think they're great. The Plugs are more comfortable to wear than the iPod's original earbuds are, and the sound is much better. Highly recommended.
Rating:
Summary: Get your own earplugs
Review: I recently purchased these to have a pair the would make listening on the bus bearable. They failed at one critical point...I was unable to get them in my ears! Despite the range of cushions that came with it, I couldn't get any of them to fit. But after a quick trip to Walgreens (to get nicer earplugs) and a little work with a soldering iron, they live up to their initial purpose. While the sound quality doesn't blow me away, for the price they offer excellent isolation. They block out sound as well as the earplugs would have. One problem is they are extremely bass heavy. While at times that doesn't matter, when I'm listening to classical the balance isn't too good. In summary, you might have to shell out a few more bucks for better earplugs, but after they offer the most isolation of any earbud under 50$.
Rating: 
Summary: For people with unlimited time to fit earphones
Review: I have no idea how people can achieve to fit this thing properly. Me and 4 of my friends with different ears have tried to fit this earphone and even after 15 minutes nobody achieved a proper fit. The thing expands within a second (and I mean 1 second!). There's no way you can plug it into your ear within that time. My normal 1$ earplugs (which I use at night) work much better than the material Koss chose. Nice try, but not suitable for most ears...
Rating:
Summary: Thanks Mint78!
Review: Well, mint78 has a great idea for getting these to stay in with the foam plugs they come with - remove the foam plugs, roll them to squeeze them down, insert them without the earbuds attached, then insert the ear buds into the foam plugs (that are already in your ears). With them in the *right* way, they go to up a solid 4 star, especially in light of their price. Warm, clear, sweet, smooth. Good lows (boy they really go deep!), with all the midrange smoothness I mentioned earlier. Highs are smooth and clear, though a little subdued. Voices are natural and listenable. I am blown away at how good these are. These aren't in the same league as the best normal headphones (such as high-end Sennheisers and Beyerdynamics), but they are so far ahead of others in their price range it isn't funny. A very affordable (and to my ear, better sounding) alternative to the Sony MDR-EX71. Amazingly highly recommended.
Rating: 
Summary: Surprisingly good, with some work...
Review: I bought these on a whim - they were $2 from a place that deals in closeouts and overstocks. The foam Koss uses that goes in your ears will not stay in my ears - the phones kept falling out, no matter how I squeezed it down before putting these things in my ears, or which of the foam plugs I tried (4 different sets of plugs come with the phones). Useless. But I had read that the ear protectors that shooters use can be adapted as substitutes for the foam plugs. So I found a set of shooters' plugs that had holes down the middle (Silencio Super Sound Baffler earplugs), trimmed to them fit the Koss, and started listening. The Koss phones are very good. Mids are open and smooth, voices are natural. Highs don't go out very far, but are not accentuated; also very smooth, very listenable. Deep lows are missing, but that's highly dependent on how well the earplugs seal in your ear. You really get the feeling you are listening to a quality transducer - much better than even the list price would lead you to believe. It is not a warm sound - it is a balanced, neutral sound that is easy to listen to hour after hour. What really is best about these is the midrange, and how natural voices sound. Where they err, they err by subtraction (rolled off lows and extreme highs), which is better than what many other phones do (accentuate the lows or highs through unnatural resonances). They are not 5 star material, but 5 star phones cost hundreds of dollars more. They are worth the effort to modify with good replacement earplugs, and are certainly worth the price.
Rating:
Summary: Best In-Ear Headphones I've Used!
Review: I just purchased a pair of Koss "The Plug" Portable Stereophones and they are wonderful! Picked them up at K-Mart for $14.99. Opposed to other reviews, I had no problem getting them in my ears. Perhaps I just have big ears. Unlike ear bud headphones, these cause your ears no pain during long listening sessions. Since the cusions on the headphones expand to fit your entire ear canal, most outside noices are muffled out. I'm using them as I type this review and can't even hear myself type. Also, they provide great sound quality and you definatly don't need to crank the volume up while listening (unless you want to be deaf). As I said, these are comfortable headphones, great for long listening sessions, at a great price. If you're in the market for in-ear headphones, I would definately pick up a pair of Koss "The Plug" Portable Stereophones.
Rating:
Summary: A Very Good product with 1 disadvantage
Review: As for those who are not able to get this thing into their ears, I like to tell them, you are not using it properly. Anyway, I'm having the same problem getting this thing into my ears at when I first buy this product. The instruction on the package said that I should roll the foam (the rubbery sponge thing on the earbud) in between my thumb and index finger before inserting it into my ears. It doesn't work. It still won't fit in my ears, it sounds awful and they keep falling out. After a few trial and error, I have came up with an alternative. I would first REMOVE the foam from the bud, roll and squeeze them (just the foam without the earbud) into my ears (something like trying to stuff your ears with cotton). Let the foam expand THEN only fit the earbud into the foam that is already inside your ears. It takes quite some time to get use to. It is generally a good product, awesome product. I used this for my daily travelling on bus and train. They are very food in blocking outside noise. Nevertheless, it is really troublesome having the wear the thing like that. Especially if you have to insert/remove it repeatatively, like receiving a phone call. But at $15 it is a good buy. If you are willingly to spend $50 for a similar ear bud, you can try on the Sony earbud that is used in their popular noise cancelling ear bud MDR-NC11. I haven't tried those ear bud yet but it does look like it will be much easier to use than the koss. But then again, it $30+ more.
Rating: 
Summary: Good sound but don't stay in the ear.
Review: I found no way in 2 years to get these earbuds to stay in my ears, but if they did the sound would be awesome - very deep bass and no outside noise.
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