Koss Porta Pro 2.0

Hi. So I bought these for 20 (they are on sale and the sale ends soon, so i took the risk of them being worse than the classic) euros and Am uncertain whether I made a good choice. I know it probably depends if I like them or not. I just would like if possible to know whether these are better or worse than the classic version. I have both but I don't have 'golden ears' so that I could compare them reliably soundwise but the build quality seems similar. I looked for a good comparison and info on the net but I didn't find one. If there is somebody with info or experience about them, I would like to hear about these portapro 2.0 phones more especially when compared to the classic ones.