Summary: I love the PXC 450s. I'm partial to Sennheiser sound - and these are no exception. They're marketed as travel headphones and fully deliver on that promise: a sturdy but flexible case that will fit into any bag, good sound on the go, and decent noise reduction.
Pros: Strong build, nice adapters for airplane or studio listening, classic Sennheiser sound.
Cons: Without a headphone amp, sound will be noticeably quieter due to high impedance.
Summary: Just an all around outstanding product and definitely worth the investment if you are a serious music listener. I purchased these to replace a broken pair of another brand headphones that I use on my digital keyboard.
Summary: Keep in mind I am hearing impaired. These headphones are amazing. The comfort of the ear cushions is unbelievable, I can finally listen for long periods without any discomfort. As for the sound, it's incredible and clear.
Pros: Excellent sound quality, durability, and noise cancellation. Comfort.
Cons: I always forget to turn them off when done so I finally got smart and started using rechargeables
Summary: Let's face. They aren't cool. My coworker says that they make me look like a space alien. At least, I assume she means the headphones. But they are amazing phones. I have tried top of the line Bose and Sony. This one beats them. First of all, the passive pass-through. Battery down?
Pros: Hands down best isolation ,best versatility, best sound.
Cons: Bulky. Sorry, you are not cool wearing these things.
Summary: I bought Sennheiser PXC 450 after years of replacing parts on the Bose. Bose materials are as cheap as you can find on any sound canceling headphones.The Senn's offer power off option for just music listening and their build quality is awesome.
Summary: As other users have stated, the headphones live up to their price and reviews. Excellent sound, easy to use controls and noise reduction is outstanding, even when you're seated over the engine of a 737. They pick up the most minute sounds in any genre.