The headphone is solid, short braided cable ca been a year since I was bullied in my bags and it is always!
Bought 7 € that asked for more!
Comfort level> very adequate
Strength level> very well
Upgrading its> not too bad, lacks a bit of treble and bass reborn with a simple bass boost
I took 2 for this price, after the people who complain of its ahaha listen to the 3 / 4 time with the rotten mp3 dynamics 3db ^ ^, in a street noise to 70db of noise, I will like to see what they think they hear. It is not a HD25 but good on the ear qd was not one buys a headphone that does everything so there!