I just wanted (very respectfully) to respond to a few of the ideas here, because I think they raise some interesting points.
All headphones do, of course, have a different sound signature. In high-end headphones, sound signature is a carefully refined combination of several elements in some form of balance/cohesion/negotiation: detail, depth, sound stage, warmth, etc. In less expensive headphones, the sound is determined by the drivers that happen to be in the headphones, what the general shape of the enclosure does to the sound, and what the shape of the pads do to the sound. They sound different, yes, but that doesn't necessarily mean that all sound signatures are equal. Just like with movies and music and art, we can talk about both taste and quality, because they are different things. If you don't respect the quality on display at art galleries, that's fine, but don't pretend that your child's finger paintings are equally good just because you don't know anything about art.
This, ultimately, is the whole point of audiophilia. There are some absolutes, and it isn't only about taste. I don't like the Sennheiser sound signature, but I respect that they are high quality headphones and understand why others do like them. They are equal, in my mind, to the headphones I own (caveat: I haven't tried the really high-end ones). I also just listened a bit to one of my students Wesc cans this week. I don't like their sound, either, but they also sound like crap. They are not equal to headphones that do get respect around here. It's not just about snobby respect for price, either, because you'll see how much respect that some budget headphones get around here. It's about companies that are able to deliver either a respectable studio or audiophile level of quality for a reasonable price.
Back to my taste vs. quality point. There are plenty of people who would never read restaurant and food reviews, because they are perfectly content with fast food. Those people may even not get why anyone would go to an expensive restaurant and spend so much for the same amount of food. For people who do respect food quality, though, it's worth it to pay $50 for a meal--as long as it's a meal that's worth $50. This is why we hate Bose. Most of us have listened to their headphones at least a little, and people who are used to high quality sound can immediately recognize that Bose charges gourmet prices for fast food quality. Despite that, the masses seem perfectly content to shell out these high prices for lousy sound. And I do mean lousy sound, not just an undesirable sound signature. The masses are uneducated. That's why it's useful to have a forum like this where the few people who ARE educated hang out. Just listening to music doesn't make you an expert on sound quality, and more than the fact we all eat makes us all food experts.
All of this, I'm sure, makes me sound like a bit of a snob. I can live with that. I have about 500 movie reviews published, and I acknowledge publicly that I am a movie snob as well. I've seen enough movies that I can dismiss some as utter crap. The uneducated masses may enjoy these movies, but that doesn't make the films as good as great films that they have never heard of. The same is true of Bose. We can, and will, continue to bash them. As an audio company they have earned all of the disdain they have from the audiophile world. If they start making products that are worth the money, we'll find out and give them the respect they deserve. In the meantime, we will keep pushing the companies that are able to deliver higher quality for less than half the price.
We're all snobs about something. Here, we happen to be snobs about headphones. These guys know what they're talking about, though.