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I recall picking up a pair of these for a fiver since I wanted something a little better than earphones but didn't want to walk around with studio headphones on.
This being said I still got a few cyborg remarks from my friends :).
Sound quality wise these sound pretty good. They're not uncomfortable either. Though it's when you take them outside that you may feel a little disappointed - noise-wise they keep very little out. Plus if you crank the volume (or bass) to compensate the trebles start to 'flanger'.
This being said I can't really fault them otherwise. If you're just going to be using them in-doors, out on a countryside walk or somewhere that won't be noisy then they're not bad at all.
It's worth noting that the clips are detachable - in some ways this can be a little annoying as if you catch them on something they come-off, but I guess it's better than them breaking.
All in all if they meet your criteria then go for it.
My husband bought a pair of these as part of his search for Headphone Nirvana. I've wound up using them more, though, and while I can't give a detailed technical review, I can vouch for them as excellent headphones. I use the Koss clip-ons mostly at home, typically while playing games on the laptop while my husband watches TV. The high-quality sound reproduction means I don't have to crank the volume way up to get immersive sound through the headphones in a room where there is some competing background sound - which is good for my hearing, but also means that others in the room aren't bothered by sound coming from my headphones. They do seem to maintain the sound quality at high volumes, though, if long term hearing damage is what you're into. The fact that they sit outside the ear (as opposed to the in-ear phones that block external sound) means I can still hear what's happening around me. So if someone talks to me, or the phone/doorbell rings, I can still hear it - I don't feel cut off from my surroundings. It did take me a little bit of an adjustment period to work out how to settle the hook comfortably around my ear, but now that's under control they're comfortable for long periods of wear, too. For environments where I want a high degree of external noise exclusion I find that either big over-ear phones or smaller in-ear phones with soft silicone surrounds on them are better, but the Koss KSC75s are my favourite general at-home headphones. I've stopped taking them to work, however - I found that under extreme handbag conditions the phones tended to pop out of the clip that connects them to the earhook.
I bought Koss KSC75 headphones from Amazon for about £15. I have been using these headphones for 3 years now, and I have yet to find any headphones that perform better than Koss.
This is the official manufacturer's product description from Amazon.co.uk
The KSC75 features dynamic elements for an exceptionally wide frequency response from 15-25,000 Hz. A 2 mil. titanium coating on its diaphragms increases the rigidity of the element, minimizing mechanical distortion and ensuring exceedingly accurate sound reproduction. Computer-optimized neodymium iron boron rare earth magnet structures allow the KSC75 to deliver greater volume, even with low-voltage portable devices. Oxygen-free copper voice coils improve signal transmission and conduction for cleaner, clearer sound. Perfect for travel, the KSC75 includes a straight dual-entry four-foot cord, and a L-shaped gold-flashed 3.5mm (1/8") plug.
In the past I have tried using ear bud style headphones, but they never seemed to fit in my ear properly and would make my ears sore after awhile. These Koss headphones are so comfortable, the design fits around the natural curve of the ear and the speaker itself sits next to the ear. The clip also pivots as you move to make a more enjoyable wear. I can wear these headphones for hours and my ears are never sore and they never fall out of my ear.
The sound quality is excellent; you do not need to crank the volume up on your mp3 player because even on a low volume the quality is still brilliant. The sound that comes from these headphones is not tinny in any way, which can happen with other models especially on high volumes. I love using these headphones on plane rides as well because the sound remains crystal clear even over the loud noises of the plane.
The durability of these headphone is another added bonus. The clips themselves are made of titanium, which will stand up to the toughest situations.
One of the best things about these headphones is the fact they come with a lifetime guarantee. What other company offers that? If there are any problems with your product you can send them back to the company, no questions asked, where they will be repaired and sent back to you.
I would highly recommend anyone buy Koss KSC75 headphones for a more enjoyable listening experience.