For my part I use them for several months with no real problems
I expected more from seinheiser (especially for a € 25 headphones) but they are still in good order.
The Pros: low-medium-present but very well defined, for someone who does not like to be overwhelmed by the bass, the sound it quite corespondra.
-The present volume settings on the headphone
-The cable is securely attached units of the earphone (sse setting does not amount to the only solder terminals) and finally the jack instead of the old right angle into the pocket faitchier)
The least: - (for me) low enough presents
The volume-control could have been much more careful (at a time when it cracked but it does more, and a certain lack of precision in the control)
-Distorted treble has a volume that is honest for mio (now this may be my ears are starting to fail ...)
In short, the price is a little unfortunate to have a product like this. The sound is really huge qand music is very good quality (like mp3 or 320Kpbs Lossless) and we feel really good resonance and we feel that the listener reacts really well. I think these headphones are made for perceived (a pink martini with these headphones and go) rather than rock and the sound is quite deformed in the end.