Pros: Exellent sound quality, cheap, comfortable, built quality, Foldable. bass heavy.
Cons: Gets a bit uncomfy when one sweats. A bit bass heavy.
I´ve owned these little bastards many years now, and loved every minute. They are compact in size, but huge in sound. And i mean hu-ge!
I remember when i bought these for travelling and to-go-field recording and just could not believe my ears.
When i compared these on Grado SR60, In some areas these are better!!!
Some says that PX100 are a bit dull and doesn´t have high end sparkle, bu i say that these are remarkable flat in over all sound. Tho they are a bit
bass hevyish, but i think that in portable headphones, wich you use mainly outdoors and such noisy enviroments, it´s a good thing.
I have used these so much that cushions wore out and i find that new ones from sennheiser costs quite a bit. But no worries, you can buy Koss porta pro-pads and
have perfect fit and four pairs on price of one senn:s