Bests & Worsts Reviews from Amazon

I love PortaPros but the past 2 pairs I have ordered from Amazon do not match the quality of previous pairs I have owned. The latest pairs appear to be manufactured differently; they have issues with sliding the plastic tabs over the metal strap, popping and muddled sound, and a plastic cover where the screw was on the left can. I had assumed initially that this was a change in the manufacturing process, that is until I received a pair of the special edition Koss PortaPros that were recently release, which were identical to my previous pairs in every way except the color-way. So either the generic colors are being manufactured differently or the headphones I have received are not authentic. I will say these headphones are usable, though having owned multiple pairs the pairs I have received do not live up to my expectations. My review for the previous pairs of headphones would be 5 stars, unfortunately the latest pairs I have received do not deserve the same rating. I have attached photos comparing the build quality of a previous pair I own to that of what I received from Amazon. You'll notices differences in the molds used to cast parts of the headphones. These capture some of the issues but its hard to explain the feeling of what appear to be tight manufacturing tolerances and warped plastic.