The MM 550 is well built, with comfortable padding and metal hinges that allow the large earcups to fold up for travel.

iPod playback; SRS WOW HD; Great Sound

Very expensive

These are some great headphones, but very strictly criticized by most of their owners. The problem is that these are targetting audiophiles who demand these $500 cans sound the way a $500 pair of cans would sound with an amp, and whatnot. That's not realistic.

I was looking for a quality product instead of those expensive headphones that sell b/c of their brand name. This was it. It had all the features I desired somehow fit into a reasonably sized headphone: bluetooth (with optional wire), SRS, talkthrough feature, and noise-cancelling technology.

No, I would not recommend this to a friend

Build Quality; Compact; Great Sound; Lightweight; Noiseguard; Stylish

2point5 mm jack; Poor Value; price; Uncomfortable

Some headphones are built for kicking back on the couch and melting into the music. Others are built for the road, whether it's a long flight or just cruising around the hood. Sennheiser's travel-minded MM 550 wireless Bluetooth headphones fit the latter category - they're some street-ready cans...

Slick design; Compact and foldable; Loaded with travel features for different listening environments

Nonstandard cord could be a hassle to replace; Closed design and tight grip may cause ear fatigue during long listening sessions; Steep price tag

Bose and Beats are all smoke and mirrors these are the real deal! they are a must have for the audiofile on the go. I've just got my Audez'e LCD-2 today, can't imagine having to listen to the mm550's, but for walking and moving around they are pretty good with bluetooth and my Atrix 4G

Great Sound; Very Compact

cannot think of any =

Good dynamic with a high yield for this headphone that incorporates the highest technology and the expertise of Sennheiser.

I didn't enjoy spending this sort of money, but trust the brand so made the leap, the sound quality for Bluetooth is amazing, these are easily comparable to a wired set of cans. Anyone needing the noise cancellation function should stay well clear though as the function on these headphones simply...

Headphones don't come much more feature-packed than the Sennheiser MM 550 Travel, a set virtually identical to the PXC 360 BT. They offer active noise cancellation and Bluetooth wireless streaming, as well as an SRS "3D" sound mode.

Feature-packed; Comfortable

Noise cancellation ruins sound; Slightly fiddly to use; Expensive

Can't decide if you want a wired or wireless pair of headphones , or one with active noise cancellation or without? If you've got the cash, you can have it all with the Sennheiser MM 550-X ($499.95 direct), an extremely well designed set that covers practically every situation you'd ever encounter.

Very expensive; Noise cancellation performance, while solid, isn't class-leading; Audio quality takes a big hit when noise cancellation is activated