Pros: Amazing sound, by far the best and highest quality pair I've even owned.
Very accurate highs and very accurate base down to the lowest freqs. They don't show off a lot of bass which I like. The overall balance of the headphones is very nice. nothing gets too loud. The very high freqs do not blare, the very low bass is very clean and tight.
The ear cusions are very comfortable and fit well around the ear without causing pressure points. I've slept with these, moved with them, gone through airports with them for almost 4 years. everything except for the plug has held together.

Cons: The top head band can become uncomfortable and is not padded well enough, but if you adjust it well enough you can lessen the pressure on top of your head.
The cable plug became shorted recently. I had it replaced and now they work again. I would not recommend doing it yourself because of the lacquer coating on the wires.

Other Thoughts: Awesome quality sound for the price.
comfort is great for the price, but could be better
I've listened to a pair of those beats headphones which are equal value, and I think these have much better quality sound.
Definitely worth the buy

Pros: The sound quality is excellent and the attached wire is plenty long.

Cons: I wear them backwards with the right ear on my left ear and vice versa. It may be that I have a weird shaped head, but this is the only way I can wear them for extended time (10+ hrs)

Pros: Everything in the "details" section.

Cons: Some people have complained that the bass is too weak; I have no idea what they mean. I would say the base is simply not overwhelming - it's clean and doesn't get in the way of the mids & highs.

Other Thoughts: I remember first using these to listen to Nine Inch Nails - The Downward Spiral at least 6 years ago. Since then, they've seen use to the point where the ear cushions are VERY worn, and I've taped together the plastic part just below where the metal band is exposed (when the adjustment is extended to larger sizes). Nevertheless, I've become attached to these headphones. If I'm listening to a new album that I really want to appreciate, I use these headphones.

Pros: Good sound and comfortable

Cons: The covering over the foam cushions came apart at the seams. I used the headphones very little. I would expect that something from Bose would have better quality. When I contacted Bose they told me they were sorry and I could purchase new cushions.

Pros: I've had these Bose headphones for nearly two years now and I have not experienced any of the deterioration experienced by others. The padding around the ear is still in like new condition, the sound quality has always been fantastic, and they seem to stand up well to mild abuse. I've rolled over the cable with my office chair numerous times and accidentally yanked the plug from the jack a couple times and it's still working great. I use these mostly for listening to music on my computer at work.

Cons: None.

Other Thoughts: I paid the about $135 for these about two years ago so this $50 off you see now is a good deal. Detachable cable would be nice which is offered on some Bose headphones, but not these.

Pros: These headphones really had a great "wow" effect when I first tried them in terms of quality of music.

Cons: After 2 years of owning them (but not using them very often) the cushons are deteriorating a bit which I wouldn't mind if Bose didnt want $35 to replace them (the cushons that is) Also these headphones aren't all that great at blocking out ambient noise for being around-ear style

Other Thoughts: Good headphones, but to me not worth 100+ dollars

Pros: Great sounding and comfortable.

Cons: Just like all the rest have been saying. The cushions deteriorate and the plastic housing broke due to natural wear right below where it has an L and the spot where the R is cracked. Bose offered to replace the headset for $60 and the new headset has a new 1 yr warranty. I guess this is better than nothing.

Pros: I love there bose headphones ive had them since Christmas and have not had one problem with them. They are by far the greatest headphones ive ever owned. The sounds is crisp and still holding up perfect.

Cons: the head band around the top does start to hurt after awhile so you need to move it around but other than that perfect.

Pros: These look great and are quite comfy. The sound quality on these is wonderful, however...

Cons: As others have said, the build quality on these is AWFUL. I cannot emphasize that enough. The headphone jack will inevitably break on you. I fixed it with a replacement jack, but then the wires at the cups started to fray! This is my second pair, never again will I buy these. Nightmarish.

Pros: Good bass, mids and highs. Lightweight. Sealed out extraneous noises pretty well. Comfortable around my ears.

Cons: As another reviewer mentioned the quality of the construction is not the best. The adjustable sliders broke several months ago and I used tape to hold them together. Finally, yesterday, the arm snapped off of one of the ear cups right above the pivoting yoke. It surprised me as I had just slipped them off of my head and set them down on the desk.
Also, as stated by others, the head band is not very comfortable. After extended use I find that I have to move it to different positions on my head or even behind my head to alleviate some of the pain/irritation.