Low quality/price ratio
Bought to replace the almost puncture-proof CX150 (~20€) which have lived a long time, the 10€ difference for the microphone is really not justified because its quality is very bad.
The sound is correct, without more, but inferior to that of the CX150, just like the comfort of the port.
A small detail that completes the whole: there is not even an L/R indication on the headphones...