This small headset is offered unchanged since 1984 and has its fan base acquired with law. For the Porta Pro I purchased for just around 28 there is only one judgment: Sensational !!, sound very clean, bass coming ordendlich .I can only say: people will buy you this little piece of art from the 80 Jahren.Einziger small drawback are the thin cable, but these are probably the comfort geschuldet.Und yes, I have acquired a orginalen Koss!