I have had a 271 and a 271 mk2 version. I think they are more of a professional's headphone, the average listener would find them pretty flat and boring. Even a hardcore headfi-er (like me) would gravitate more to the akg open headphones
You beat me Gelocks! I have had these a few days and was thinking about starting a thread. However, I always wait now so the newness wears off (for good perspective). I got mine off ebay for a very nice price. out of the box I said 'wow' great sound for the price. Now that its been a few days I can be more realistic.
-looks nice, the metal caps are really cool!
-construction-all plastic headband-I wouldnt bet on longevity here, these glossy...
I have had some of the old electrets, nice detail, but lack bass. the pro4aa was very popular but sounds wonky by todays standards. the pro4aaa (vintage) is ok but still kind of dull by modern standards. the hv1a is a very nice vintage open air can.
for modern koss, i like the pro4aaat best (still have it). the dj100 has the most modern, consumer friendly sound
most koss cans need a good amp