I use it for a month and what I like most is the return, even before the break. As for the least?? printing tighten a bit at the start and few minutes later, we feel more. I try a lot of model sennheiser, akg etc ... I spent a good impression on the sony mdr cd 850, its a little flattering, but good. The MDR 7509 HD is something else. sound ... true, everything is there, even the defaults. For the value, quality will pay. And experience, whether I do it again this choice?? The future will tell me, but for now, I do not regret in any way for purchasing this excellent headset.