Pros: Comfy, comes with lots of accessories
Cons: Not all that neutral, numerous cons in the sound outweigh the positives, build quality is meh
I liked these when I first got them but over time as I listened to more and better headphones realized they are not very good. They're not all bad but I think the cons outweigh the pros. There are already enough hyped up positive comments from tons of people, so I'm just going to list what the problems were for me.
Not really all that neutral. Perhaps more balanced relative to some of the wilder headphones out there and mostly non-offensive, but that's about it. Overall balance is actually a little bit on the dark side. I'm no treble head and hate any spikes in the higher frequencies, but even for me these sounded a little bit veiled and lacking clarity. The treble on its own is very smooth and had the most accurate tonality for cymbals I've heard, but the bass/lower mids are quite muddy and smeary and get in the way. There is a dip in the lower mids and then a hump in the upper bass which I think contributes to this. The muddiness sometimes creeps up into the mids as well unfortunately, because the mids are actually pretty nice. I noticed that frequency response graphs actually confirm the slightly dark balance.
The soundstage is wonky with a hollowed out center image. At first I mistook this for depth, but it's not, it's just shaped weird. Basically, things which are panned in the center sound farther away, while things which are panned in the left or right ears sound closer. Kind of like a "V-shape" where your head is staring down into the point of the V if you can imagine that. Other headphones with more evenly shaped soundstages do not do this so much. I also found these to lack punch and attack both in the bass and the mids/highs. I find too much punch to be fatiguing, but these just sounded kind of flat and boring.
The other thing about these headphones is the cup sound or echo as some have called it. If you take a look at the way the cups in combination with the pads are shaped, you'll notice they form a cylindrical or tube shape. Listening to music on these headphones sounds like that--listening to music through a tube. It sounds like there is some kind of reverb added on to the music, which makes you feel you are listening inside of a cave or a subway tunnel or something. I don't know exactly how to describe it, but frankly it is pretty strange. It is less noticeable on some recordings, but on others it is very obvious and weird if you have other headphones to compare to.
Also while they come with a bunch of neat accessories, the build quality is not all that great. It's not outright bad, but questionable. The sliders for adjusting the length of the headband are kind of loose and wobbly, the cups sometimes snap out of the hinges, and the headband is so rigid every time I stretched it to put these on my head it felt like it was going to snap.
If you can find some rebrands of these for less than $100 and you like a slightly dark and very laid back sound, these might be decent, but overall I don't think I'd recommend them to anybody, especially if you think you're going to get a "neutral champ."