How long have you been using?
I used it for 4 years (before I loose this summer)

Did you try many other models before buying it?
Aside from DJ headphones from different brands, no.

What is so special that you like most and least?
most: It's pretty solid, good sound quality, fairly neutral, although a lack of bass ... it has a good sound insulation (closed headphones)

least: It is very tiring to wear in the long run, although it is comfortable, this headphone is quite heavy and imposing.

How do you rate the quality / price?
Correct

With experience, you do again this choice?
No, I would take a range above (beyerdynamic dt 770, Audio-Technica ATH-M50 ...)