What I've been looking for.

Bought these for $380. I have not used these to test calls. Does more than I originally thought with my iPod. Pressing the bluetooth button while it's active will activate the voice recognition program (Siri for later devices) and will use the built in mic for you to talk to it.

(This is a review for the Sennheiser MM 550 headpones, not the MM 550-x.) Comfort: Wore these MM 550's for 5 hours with no breaks (With glasses on as well) and approx; 10 hours total in one day; No noticeable discomfort once they're adjusted properly.

Make sure to charge these fully before using the first time, mine were at 1% juice and died after about 10 minutes; Noise cancellation may suddenly stop working for 1~3 seconds rarely when at mid-low battery.

All in 1

I've always wanted a pair of headphones that could everything, and I finally found one, the MM 550X. These headphones are the best bluetooth/wired headphones I have tried. I owned Beats Solo HD's, Beats Studio's, Beats Mixr's, Wireless Beats, Bose QC 3's and QC 15's, AKG K 495's, and the list goes...

Great sound quality; comfy; practical; multi-purpose

srs? Max volume not so high

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.

Excellent

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

Great cans.

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.