Rating: 
Summary: Great headphones. Truly unique.
Review: I've been using a set of these for over a year. I love them. I have had little trouble with them coming out except when exercising. I have been unable to use them for that and still have not found an adequate pair of headphones for intense cardio sessions. I use them when driving and when I'm working around the house and in the yard. They are great on airplanes. They completely isolate external sound which makes them effective in noisy situations. They are not hi-fi and will not reproduce sound with the quality of a full set of headphones. The sound is more than adequate though. They are particularly great for spoken word recordings. I highly recommend them unless you are looking for ultimate hi-fi audio or want to use them during exercise.
Rating:
Summary: Cool
Review: I love this item it keeps in the music and they are easy to use i think any way, its very good, sure its kind of pricey but just think that you pay for these once and wont have to buy headphones for a long time
Rating: 
Summary: Good, cheap sound solution for the traveller
Review: NOTE: the description I saw on the Amazon page does not reflect the product I have. Above it discusses a headband and an adapter which are not part of this product. Also, the rated frequency response is 10-20k, not 16-23k. I think this is (or was) an Amazon editorial error.My interest for this product is as a solution to listening to music, lectures, and movies while travelling, and I travel a lot. I have a set of Panosonic noise-cancelling headphones which were good (about five times more expensive than these earbuds) though bulky, but the plastic broke so they won't stay on my head now. These earbuds are an excellent alternative to noise-cancelling headphones for the frequent traveller. I find them more comfortable for extended listening than most conventional headphones. The ability to seal out noise from the external environment is very good, and makes it possible to understand what actors are saying when watching a movie on an airplane. The overall performance - sound quality and noise blocking - is not as good as the Bose noise cancelling headphones, but the Bose are 20 times as expensive, much less convenient to carry, and subject to damage from the rough world of the road warrior. If The Plug had an optional noise-cancelling unit (say, combined with the eq), it would be a killer combination - are you listening, Koss?). The sound is good. Bass-heavy, to be sure; I would like them better if they had a flatter response, but the product is marketed at the portable music crowd, and many of them are looking for dramatic bass rather than golden-ears sound.
Besides, mobile sound is always a compromise, it's just a question of whether the compromise they chose works for you. Here are some problems I've heard and the solutions: 1. "They fall out of my ear." I think an older version of this product did not come with alternative cushions; the ones I bought recently (as pictured here) came with 3 alternative cushion pairs, one of which fit well in my somewhat large ears. To make them fit well, roll the cushions in your fingers and squeeze them down, then hold them in place in your ears while they adjust the fit. Also, it is possible to fashion your own cushions (easy modification to commercially available ear plugs from pharmacy); go to google and search for "koss plug mods". 2. What about when I have to replace the cushions, they'll get waxy/dirty with use? See last sentence of #1. 3. "They sound tinny". I have a sense that the sound was tinnier on an earlier version of these earbuds, judging from comments I've read in feedback and on the koss plug mods page. The purple plugs (as opposed to the older(?) blue ones) do not sound tinny to me; they seem a bit heavy on the bass instead. Koss also makes a 3-band eq (20 dollars) for their headphones that can be used to adjust the sound some. I have an eq on order, hoping it may temper the boomy bass a bit. Of course, your player may have a way of changing the color of the sound, but my laptop does not. 4. "They're easy to lose." The price of their tiny size and negligible weight, is that you need to be careful not to lose them. I've already lost a pair. Koss also makes a carrying case which may help, or you could just put them in a 35mm film canister. But at $... a pair (compared to $... for noise-cancelling headphones) I'll just keep a spare pair around in my travelling case. Overall I'm pleased with the price/performance tradeoff for these earbuds, and they are an essential part of my travelling kit. They sound better than any other earbuds I've used, and they remove a good bit of the ambient sound, offering more pleasure in listening. I give four stars out of five because I'd prefer a less bassy sound, though some people will really like the way they sound.
Rating:
Summary: Great headphones for the portability!
Review: It's a great set of phones, seriously. I bought these in Australia (residing in Australia) at $$AUD which translates roughly $$ but still consider it worth the buy. You can get this for half the price here, so believe me it's worth it! The plusses for this product are listed in most all other reviews; I'll mention the drawbacks to this product. Obviously no one likes spending the extra second to 'squeeze' the earbuds so that they fit in your ear. But they WILL fit in your ear, and won't fall out (I have had them in my ears for 3 hours in a row and have no problem with them fitting). They come with extra ear plugs; which are in different shapes and sizes. MAKE SURE these come with your headset since the ones already one mine didn't fit in my ear properly; I used one of the other earbuds. Aside from that, great bass; it pretty much DOES drown out most all other noise - I'm still worried other people around me can hear from my mp3 player! Though I know this isn't the case. Recommended buy; 8.5/10. Jon
Rating:
Summary: Mind Blowing !
Review: Just absolutely INCREDIBLE. Indescribable. I bet your thinking that it's a high price for some earphones...well they are more expensive than others, but do you see any others like these? The unique design makes ALL the difference. I used to listen to my music at volume 25...now, I can't stand it being any louder than 15, no sound travels between my ears and the outside world. Thats right, ISOLATION. I know, I know... not possible with earphones, right? Not if they're these earphones. I'm rocking out to INCREDIBLE bass( what Koss is known for) and not only can I not hear the bus I'm riding, but the guy who had a bad day sitting next to me isn't bothered by any music because he doesn't hear any! I'm telling you, these little things are PERFECT for little MP3players, especially the 128Mb Creative Nomad Muvu (EXCELLENT music combination). Now that you have read my review, stop wasting your time and get these pieces of gold before they're sold out, because anyone who wants to hear the full potential that their music player can produce is already typing in their delivery address and preparing for this euphoria.
Rating: 
Summary: Man these Bite!
Review: These are the worst headphones ever. Do not buy! They pop out on a consistent basis (on my 30 minute commute to work on average they pop out, usually out of one ear, 3-4 times). So I'm constantly trying to reinsert them, very troublesome on a subway. I think it's due to the foamy nature of the replaceable plugs. They do not conform to you ear's structure and thus gradually expand over time.
Rating:
Summary: Tom M
Review: After buying a Sony MD player I was looking for a set of earbud's that would allow for the low volume of the unit. The Koss 'The Plug' works great. I even tried them out while I was using my noisy lawn mower. It not only drowns out the noise but it's an instant kill switch over the wife. Wow, I can even use them around the house. Oop, what's that honey?
Rating:
Summary: uncomfortable and poor sound
Review: I suppose I have smaller ears than some people, I do have trouble getting any sort of earbud head phone to stay in place, but "The Plug" is a really bad fit for me, they fall out just moving my head slightly. And the sound? tinny and buzzy. Some people seem to like them, but they were a complete waste of money for me.
I like the wrap-around, behind the neck headphones much better. The Sonys are OK, but Phillips have some really good & inexpensive ones.
Rating:
Summary: Not the most comfortable, nor the best sound quality.
Review: I usually have avoided Koss before because of their cheap construction, but after seeing these among other quality headphones, I figured I would give them a try. These promised better sound qualtiy than your average $10 headphones, but after using them for 5 minutes, I realized that I was probably better off buying cheaper headphones. The cords are a really thin guage wire, the "ear cushions" do not really fit comfortably, and the "big bass sound" is almost non-existant unless you push and hold them in your ear. All in all they sound really "tinny" and the midrange is pretty bad. Coming from a pair of sony earbud style headphones(which I used for years before they broke), I think I am going to get rid of these and go back to my trusty old sony headphones...atleast then I know I am getting what I pay for.
Rating:
Summary: Great
Review: These headphones are amazing for the price. I got a pair of these at Circuit City for 7.99 and I love them. They take a little while to get used to. I took about 5 minutes experimenting with the different shapes and sizes of earbuds included in the package until i found the ones perfect for me. They take a little effort to get in your ears the right way but once they're in all other noise disappears and music fills your ears. My only complaint is that they are extremely bassy. I listen to a lot of live and accoustic stuff so all the bass is a little unneccessary, but they still sound great! Perfect for airplanes.
Give 'em a try!
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