I bought these after testing them from a friend which had them already.
The sound is phenomenal, really. If you are a bass head, you might be somewhat bummed out. These offer a true sound, the way it's meant to be heard. You also might want to use these with high quality files instead of streaming from Spotify / Youtube. The build quality is very good, they are mostly plastic, but the good kind of plastic. I'd that you will look good with them on the street, in the subway and etc. Also the M40x has very good isolation, people will not hear what you're listening to and you can block some of the outside sound. Also, the braided cable is very nice, bonus points that it is detachable. Overall, if you take good care for these, they will last you for long time. Now, few things I don't like:
- The comfort of these is meh, at best. The clamp is really tight, the leather pads are not very breathable, your ears will get some heat overtime. You could swap the pads for brainwavz or something, but the headphones will be bulkier, uglier and you might experience worse sound.
- Because of the nature of these, their great sound can somewhat tire your ears. After 1-2 hours of listening, you will need some break, because of all the spectrum of sounds that went through your ears. I still use some BT headphones when I just want to chill and watch youtube and etc. You can't use them 8 hours at work, non-stop, no way. Have this in mind, this combined with the lower comfort, I'd say that you need at least one more pair of headphones/speakers.
- It's hard to fit them in the leather bag that they've provided in the package. It looks nice, but they should have made it a little big bigger.