At $399, you have better options in the price range. In my experience both the Bose QC35 and the Sony MDR-1000X cancel noise better than the Sennheiser, and I personally find in-ear monitors like the NuForce HEM8 to block out noise better than any fancy noise cancelling circuitry anyway.

I bought this product a week or so ago,functions are easy to use,battery life great ,noise cancelling superb. Amazing sound, unique experience .... love music, treat yourself and listen to your Music your way ,no distraction. Awesome A+++

The Sennheiser PXC 550 Wireless is an audio first, noise cancelling second headphones. Among the ANC headphones I have reviewed so far, I would rank it the highest for its audiophile excellence with pristine treble delivery .

Great sound quality and super comfortable

The CNET "editor's" review of these headphones has completely changed my view of every ranking/ review on CNET in a very negative way. Everything he says is not just based on personal opinion, but completely opposite from my own experience.

Great Fidelity/ Great Noise Blocking

None

The Sennheiser PXC 550 Wireless Noise-Cancelling headphone is a powerhouse designed for premium Hi-Fi sound and comfort. A straight competitor to the Bose QuietComfort 35, the PXC 550 will definitely have the attention executive travelers looking to compare for themselves in the search for the best...

Even though the PXC 550 is still quite stylish, it is not to the point that you are more worried about how good they look sitting on your head more than the practicalities of them.

Wow...This is an outstanding Noise cancellation Headset in the market which is available..I had a chance to try out the headphones and I am Stunned....would love to own one soon....

For the jet set, there is almost no better consolation than listening to your favourite tunes on the go while being isolated from all the noise and sounds of the outside world. Noise cancelling headphones really do help to relieve the stress from travel and help you to communicate with your friends,...

Extremely Light and Comfortable; Balanced Sound Signature; Stellar Sound Quality; Portable; Great Battery Life

Slightly low volume output compared to competitors; Noise Cancellation could've been a bit better

Sennheiser threw down the gauntlet to Bose with their recently released PXC 550 Wireless Headphones. The Bose QC35 are often cited as the industry leading noise cancelling wireless headphones. We put the PXC 550 through its paces to tell you if Sennheiser have knocked Bose off the perch. [...]

High build quality Excellent bass-focused sound User-friendly control scheme Customisable EQ and noise isolation

Pricey Can't use EQ or customisation outside of CapTune media player