Summary: Terrible build quality by AKG. Had the upper version of these the 495nc...twice. The headband is very easily broken. Just sent my second pair back to Crutchfield. Sound quality is good and noise canceling is ok, nothing great. Very good idea with the rechargeable battery however not worth the cheap quality of the head band. Broken twice just taking them off my head. Definitely not worth the money.
Summary: The sound when playing music is excellent. Totally excellent. I am an audiophile and trained classical musician. It's also great with house, tecno, Hip Hop as the bass is excellent. They are comfortable too. It's great that they work when the battery's empty, or without a cable. The noise cancelling is better when music is playing (no... it's not just music drowning the noise). Noise cancelling is not as brilliant as either of the big Bose.
Summary: I read numerous reviews before buying, and now I've owned the K490 for several months, I wonder if the 'expert' reviewers actually tested this kit in all 'noisy' scenarios. As a regular traveller I needed good noise cancelling headphones, and initially the AKG K490 did the job. But soon after, the right speaker on my first set developed a fault with a clicking noise which I believe was related to a loose acoustic driver.
Pros: usb charging , function when not charged , integrated battery in headphones , nc is good when it works
Cons: hear external noise when nc is activated , headphones can get uncomfortable , not the most durable kit , maybe a design fault in headphone drivers?
Summary: I truly love the sound of these, I used them for my daily commute. The noise cancellation works well but I felt it could be further improved, they let in more external noises (like train doors shutting noise) more than i would have anticipated. The main setbacks are: - construction quality could be better: my right ear stopped working altogether even though I was very careful with them, it's not a cable issue, they are still under warranty so I expect them to be repaired...
Summary: The noise canceling is impressive. The sound quality average,better quality sound can be had by cheaper headphones, but not noise canceling ones. On closer inspection I noticed that the joint where the headphone attaches to the headband, making it able to swivel 90 degrees, looks quite weak and will always be a concern when traveling. It comes with a cable to recharge the battery, this is a USB at one end and a 2.5mm jack at the other.
Summary: I really miss an in-line microphone option, so no calls with these; a big omission. If you think noise cancellation is like the Bose in store demo, think again. I bought years ago some Sony in ear NC headphones and hoped the tech had moved on, the white noise has gone but the dynamic cancellation of noise is still hyperbole, it's ambient noise reduction not cancelling.
Summary: The headphones are extremely nice to have, but more noise is coming through than expected. I think the package with USB charging and the way the fold away are a nice bonus, but I would expect there are far better NC head phones out there..
Summary: Got a pair in March and for three weeks which didn't get used as much as would've liked due to work commitments. They sound incredible and the noise cancelling is beyond belief. BUT . . .they broke whilst sat in a hotel eating dinner ( about three weeks old). Richer replaced them ( thank you guys) but I am left scared to use them incase they break again and have reverted to using my £10 aircoustics (best bargain ever) . Haven't used them for at least sixteen weeks!