I bought these cans to punish Bose for their shoddy construction of my Triports that snapped into pieces repeatedly. I need a pair of headphones to get me through long transatlantic flights. These are my first impressions. The sound quality is good, I don't dispute those reviews.

The excellent product, with amazing built in quality. Based on my experience I will suggest this phone whom is looking more for the music quality then for noice reduction as music is superb but cancelation is not as great as in BOSE QuietComfort 3.

The PXC450's give very open transparent mids and highs, with deep detailed bass. Smooth sounding. These are the best sounding noise cancelling headphones I've heard. The Bose Quiet Comfort Series sounds very muffled in mids and highs in contrast with the Sennheiser PXC450's and pale in comparison.

Very comfortable, and the noise cancellation is superb. No distortion even at very high volume. Worth every cent.

I went back & forth between the Sennheiser and the Bose headphones. So far I am very pleased with these for overall comfort and sound quality. I have not used them in an airplane as of yet.

Sound Quality

Comfort; Not as comfortable as Boes

I have used many NC headphones before (Bose QC, AKG, AT), but these are the most comfortable, best sounding ones yet. A bit big, but it works perfect for my ears.

These Sennheisers have been our Award-winning cans for two years on the bounce, but they've now been beaten by the Bose QuietComfort 15 s, which sound better and are more adept at noise-cancelling. But the PXC-450s remain a great buy.

Sound far better than most rivals; snug; comfortable fit; effective

Not cheap

I bought a set of these used. What a great deal! The Audio quality is so good I began using them on my stero system to listen to analog recordings. I replace a set of Beyr Dynamic headphones. These are more comfortable. If you need the noise canceling capability, it also work superb.

After the first few hours, these Sennheisers more than justify the high price. Excellent!

Awesome noise-cancelling technology; Usual superb Sennheiser sonic performance

Expensive; Low-end grunt is slightly lacking

These were unavailable from NCIX when I ordered them, so I actually got them from another source, but thought I'd write a quick review anyway. I buy Sennheiser headphones exclusively because I've never been let down by their sound and build quality. These headphones were worth every penny.

- sound quality; - noise cancelling; - comfortable for long periods of time; - don't have to listen to screaming neighbour kids anymore; - sennheiser

- nothing