I am currently wearing my Astro A40's just for music. They RAPE all Sennheiser headphones. Don't get me wrong, I like my Sennies, I have some PCX 450's and HD650's. I used to have a pair of HD800's (the 1,300 dollar set) but the sound experience, I felt, was not any different than my 650's so I returned them. The reason why the Astro A40's whoop so much ass is due to "Dolby Headphone". Sennhiser headphone are just fancy, old school stereo headphones with a copper plug. "If" the Megladon does not use some superior or on par technology to "Dobly Headphone" they will suck a fat one just like all the other "multi spear headphone", trust me I've tried 3 sets of those. In favor of Sennheiser, The Sennheiser PCX 450's do RAPE the Dr. Dre beats, they even have a talk-through feature with an external Microphone so you can swap off the noise canceling and hear EVERYTHING around you, it amps it up... can listen in on conversations across the room. But the Dolby headphone with an optical audio jack for pure digital audio output for Dolby digital headphone, there is just no beating it.
When I first used my Astro A40's it literally gave me chills at how insane the surround sound was. Especially in games like TF2, Halo 3 and other FPS game. I could place people at any "degree" around me walking or shooting, as if it were going around me. I can't help but look around some times. You will absolutely be shocked by the insane surround sound quality. Like I said, unless the "Megladon" uses some sort of imitation Dobly Headphone technology (not Dobly Digital 5.1, Dobly HEADPHONE 5.1), it's dead out of the box next to the A40's. And even then, hell, 5.1 v.s. 7.1? I'm sorry but i'm not some sort of dog with super sonic hearing where I can tell a 1/8th degree change in sound direction. The construction of the Megladons looks superior, but at the same time I would not want to wear them out of the house were as with my PCX 450's or Astro's looks freaking banging. The Astro's earcup outsides do have "removable" sound guards, which do help a great deal if you need to hear people over your music. The amount of cord options are in-fucking-sane. If you order the headphones with the mixer there is practically nothing you can't hook into and mix naively. Also while the mic is NOISE CANCELING, and can be plugged into either side of the headphones. Comes in handy if you are bikeing or driving so your bag or belt doesn't knock on it.
Drawbacks to the A40's and were Sennies beat them...
Ok, so I like the PCX 450's "build" better (these are the noise canceling headphones from senny, NOT the HD "audio phile" ones). I have actually considered taking the Astro A40 speakers out and make a custom headphone enclosure for them. The cloth ear cups are shit. I mean, who ever put this amazing of an audio system in this shity of a plastic enclosure with this shity quality of head band should be shot, KOS plane and simple.
For the first few weeks, the damn cloth ear cups will squeak when you bobble your head or turn your head until they are broken in. I fucking want my PCX style soft padded leather cups. Those things feel AMAZING, and they stay on way better. I feel like i could throw them though the 3rd story window of my apartment and they would be just fine. Astros, I think would break before my window would.. when wear them out on the town and I drag in tired from partying and throw them on the floor and drag them around while still attached to my iPhone (yes the mic works with the iPhone!!!) I am scare the fucking things will break. There is "some" metal in the construction of the A40's but the band going over the head is made of maybe 1/4th inch plastic that feels like its the same shity plastic they make carnival prize shit out of.
anyhow, I had to put in my 2c