mkmelt, where is there a Koss outlet store? I'd like to go there!
$500 - seems like a pretty good deal when you think about it (cheaper than most dynamic headamp combos). Stats are stats in my mind ...a big jump over dynamics.
All the posts I've seen on the Koss ESP-950s (going way way back on Headwize) relate to a "squealing" problem with various guesses as to the cause, including possibly hair. Someone once suggested it was due to arcing, but it sounded like a wild-guess more than anything.
Koss offers a lifetime, no questions asked gurantee to the original owner. They would be out of business by now if arcing was the issue and not resolved by now. Seems like only two to three people ever owned these. Maybe a sleeper?
Mind you, Kevin Gilmore has reviewed the 950s before and said that the cans are pretty good, just the amp/energizer was crap. At $599 they push the price point at which you can get a get a Stax 3030 and 303 combo for approx $779 at Audiocubes, which is likely better.
Or, just pick up the 3030s for $319 and have a Gilmore SSES amp built for you - not sure how much that would cost. But still, seems a hell of alot better value than forking out big, big bucks on $1K headamp and $700 Grados.