Let's start by the obvious: These are a very, very expensive pair of headphones. They're the most expensive ones I've ever bought, and I've owned plenty of them. BUT... they're worth every penny. Let's go into the reasons why:Addressing the obvious: noise cancelling. I've tried other brand's premium ANC cans including Bose's, Sennheiser's and B&W on a store before pulling the trigger for these. I was unsure the difference was going to make the price difference worth it (Besides Bose's, the others were around $100 cheaper). But they absolutely blow the competition out of the water. They're the only pair that managed to consistently muffle not only low frequency humming noises, but even lower human speech to a level low enough that, when listening to music at the office, I'm unable to hear if someone is calling my name a meter away.Which brings me directly to the premium functions that the fantastic Headphones Connect app brings to the table. Adaptive Sound makes it so I can wear these while walking on the street, while being able to hear if a car's honking at me, or an ambulance is speeding towards me. There's a fantastic option that allows the noise cancelling to filter voice from the rest of noise, so if you work in an office with loud AC humming, you can still hear your colleagues talking. Or, if you're on an airport waiting to get on a plane, you can hear when they call your rows for boarding. And then, once you're about to board and you need to talk to the crew, you can just put your hand on your right earcup and something magic happens: Your music's volume is toned down, and every sound around you is as clear as if you had your headphones off. And, as soon as you take your hand off the earcup, everything goes back to normal.And, now that we're on that right earcup's topic... The much feared touch controlls. I have to say that, in my personal experience, they work just great. I've had one instance in which I accidentally skipped a song while I was trying to change the volume, but not nearly as terrible as people make them seem. We'll see how they behave this winter, but I read on a few places that the new units have the cold phantom touch issues fixed. I'll make sure to update the review otherwise.Sound-wise the headphones are not nearly as flat than the Bose's or Sennheiser's, but since the app has a great EQ you can tweak the sound to your liking. They sound warm, with great, deep and rumbly bass, slightly muffled mids (not too much and fixable through EQ), and balanced treble. I mostly listen to electronic and indie music, so your mileage may vary, but as I said they're highly customizable so I'm pretty sure you'll be able to find a sound that fits you.Regarding their comfort, they're not as comfortable as Bose's offering, but they're much better than most headphones out there. Super light and with good padding, the only thing that makes me take them out is that the earcups get a bit hot sometimes. However, I'm sure that I could wear them for a whole transatlantic flight without issues, since I've worn them through a whole working day at the office already, with a couple 10 minute breaks to let my ears breathe.They include a great hard carrying case, a 3.5 to 3.5 jack cable to connect them to any device that has no bluetooth, and a (way too short) usb-c to a charging cable. Yes usb-c ALL THE THINGS, it's great, but they could've definitely included a cable that's longer than a couple inches.Overall, amazing headphones, and you absolutely get what you pay for. I would recommend to anyone who spends a big part of their day on noisy environments. If that's not you, you can probably find better sounding cans for less, but if you could use some ANC on your life, these are DEFINITELY the best you can get as of today.