Pros: Sound amazing when driven by a decent amp.
Cons: Who will drive a $30 headphone with a decent amp?
I really cannot understand what market is this headphone targeted for. For all I know, this headphone needs power.
If I plug this headphone to a normal portable player (no head amp), it can sound bass-less and dead because of inadequate power.
However, if I plug it to a decend head amp/integrated with enough driving, this headphone can be very pleasing, especially for a closed can.
I have a feeling that this headphone can be better received by the market (at least being treated more seriously) if the price is a few times more.