From a guy who tested them out at BestBuys and The GoodGuys. They are comfortable, they do take away alot of outside noise. Very light weight. And they did not look cheaply made. But the Sennheiser's (I happen to test the 580's 500's & 570's) felt far far more comfortable and the sound was much better. Now I happen to like open air i feel that my ears can breath better and the sennheisers were extreamly light as well.
The Triports felt like rubber, the Sennheiser's felt almost like soft worn in leather. As far as looks goes, the 580's looked really nice in person, there much darker then in the photos. Sennheiser also has the HD 25's which you might like if your looking to cut out background noise.
Really depends when your looking for in a pair of headphones. I agree with all the people who stated over and over again that when you buy Bose, your paying a huge fee just for the Bose name.
I can't stand close air, specially when i'm on the computer. I can just imagine me sitting at my computer, getting real into my music, and then my sister comes from behind and asks me a question, taps me on the shoulder and scares the **** out of me. That's not what I want. lol. With the open air, you can bearly hear outside noise, but yes you can still kinda hear. SO when your mother/wife/girlfriend shouts Christopher! or your name... you can hurry and take off your headphones and run to them before their pms really kicks in.
Hell in the store my father and the sales dude were having a conversation right next to me, along with all the background noise from people listing to the radios, tv's, etc. Listing to them on my panasonic portable, and decent listening levels, I couldn't hear them. I was to busy enjoying the music. I'd image that if i was to take them home and listen to them in a non-noisy envirnment, I would be even more impressed.
Find a local Good Guys store, it's much quiter then bestbuys and the sales team are far more knowlegdable. BestBuys only had a few display models and their hooked up to some unseen reciever with a demo sound clip. At the good guys you can bring in your portable and they'll let you listen to them on your portable with the cd of your choice. Plus GoodGuys has a much larger selection for testing, the HD 580's weren't even on display, the guy went back talked to the manager and asked if he could take them out of the box and let me demo them. If your going to be listening to a pair of headphones for long periods of time, and you don't live in a real noisy envornment, why not go with open air. Let your ears breath, they feel very light in most cases.
I could barly feel the HD 580's on my head. They look heavier then what they are. Plus they don't touch your ears, so they feel even lighter. The Triports feel like little suction cups over your ears, feels weird when you take them on and off.
Sennheisers man, go with sennheisers, find a model that suits you. There are the most comfortable headphones.
Honestly, I really wanted the Triports before I tested them and learned about the Sennheiser's HD 5xx series.