Pros:
^Quick set up. Takes only a few minutes to be up and running.
^5.1 sound.
^Sound quality is actually quite good.
^The 5.1 can be awesome in some games (COD4). It's nice to know where the shooting is really coming from, and where all the action is.
^Wireless.
^Somewhat ok price at $140 (best buy).
^Chat volume and Game volume have seperate control.
^Can hear your own voice (helps to prevent you from yelling in games). Although it has been dialed down from the X3's.
^Optical Digital input, WITH passthrough output as well. And it included an Optical cable. If hooked up properly, can be used for anything (Blu Ray, TV, HD-DVD, xbox, ps3, etc).
^Comfortable Cloth swivel ear cups.
^Microphone is detachable. And there is Less hiss when it's detached.
^Bass Boost is nice for watching movies.
^Auto Off feature. Automatically turn off if no sound is detected after more than a few minutes.
CONS:
*5.1 is Not as awesome as I was hoping. It can be great in some games. But sometimes the distinction between front speakers and back speakers isn't as obvious as I would hope. Better for games than Movies.
*Hiss. Gets worse when the volume is turned up. Not noticeable in loud scenes, but is in quiet ones. Still, not a deal breaker for me.
*More hiss with Plasma TV's.
*Over the ear headphones tend to make your ears a bit too warm after a while.
*I noticed while playing RockBand that there is just the slightest Lagg that made me miss more notes than normal. Typical of wireless technology.
*Can not handle DTS Master audio format (From some Blu Ray movies).
*If I want to listen to MUSIC, Use something else. These sound very nice, but not great. Music should not be listened to with HISS.
*Line-of-site wireless. Put your hands over the transmitters, and you lose all sound. Not that you would do this intentionally, but it just shows how important it is that you are in line of site. Actually I guess it could be a nice "Muting" feature.
*For chatting with the XBOX, you need to be WIRED to the controller.
*People have had problems with the Mic not working after a while. I noticed with mine, that I need to turn on the phones, and connect to my 360 controller, BEFORE turning on the 360. Otherwise, they sometimes don't Pair properly.