Pros: Flat response, Precise sound, Comfortable, Price
Cons: The soundstage is'nt big enough
I got these in Guangzhou for the absolutely low price of $55. They're quite small in size compared to some other headphones I've seen.
I have been using them for several months now, & I'm very satisfied with their comfort, especially during long listening sessions.
Pairing them with a headphone amp does improve output quality marginally. I use mine with the Fiio E17 portable amp that has more than enough power to drive these. The music is accurately detailed but not very lively. Movies with heavy soundtracks (eg Lord of the Rings) sound great on these.
I'd recommend these phones for music with heavy beats(eg, rock, house, hip-hop & trance). Jazz& classical are also a pleasure to listen to though the soundstage could be better.
Overall, these phones are worth the money spent and would rate their audio quality as 8.5/10.