The build quality on PX 100 ii isn't just poor. It is actually made as if it were a disposable headphone. Sennheiser needs to apologize and fix it on a new release.
I disagree, PX100-2 is a huge improvement in build and cable quality over the PX100-1. From my long experience the newer model tends to last substantially longer than the previous one. Given the price, it is indeed a disposable headphone. I would however be happy to pay a premium for getting a detachable cable or even a Bluetooth option in a future version of this model.