Summary: I am an audiophile from way back (I am 49 as of this writing). I have owned Sennheiser Headphones since the early 80's, and in my opinion nobody makes a better headphone than Sennheiser. I have a full size, enclse the ear pair of Sennheiser noise cancelling headphones, and love them. The sound quality is much better than my wife's pair of Bose Quiet-comfort that she bought at the same time. Noise cancellation is similar for both. I bought this pair for my niece.
Pros: Small, lightweight and awesome sound one would expect from Sennheiser headphones. Less expensive and less intrusive than full ear enclosing 'phones.
Cons: Not quite as good at noise cancelling as my full enclosed ear headphones, but that is expected for on-the-ear 'phones. Would have preferred a hard case to the pouch for travelling.
Summary: Just received my headphones and I am very happy. As I was taking the headphones out of the box, I was concerned with the side of the headphone pads as they are smaller than what you see on other Noise Canceling headphones. But when I put them on I immediately noticed that the a significant drop in room noise, and even more when I turned on the power.
Pros: Great sound, light weight, and fold into a small travel size
Summary: I bought my husband (a very frequent traveler) a set of the Bose but bought myself a pair of these since I travel about half as much as he does. These are great. Very lightweight and compact. They reduce the noise very well. These are smaller and fit on my ear so after very long flights (8+ hours), if I sleep with them, my ears get a little sore but I think it is beacuse I am laying on them. Yes, Bose are better but these work very well and are a good deal (price-wise).
Summary: I am a software developer and listen to music all day to keep the surrounding noises down and to concentrate better. Sound, comfort, portability were priority. Even with the On the Ear features, it doesn't just as well as Over the ear egg styles. And actually better than those because these don't push on my glasses against my head. but comfortable that they aren't a big pressure I love these head phones, compact, light.
Summary: I've heard the Bose and bought these instead. Smaller, light weight and foldable in a nice case. Great sounding. If you travel a bit and want to stay light then this is the headset. Nice and comfortable. I did a 16 hour flight from Newark to Singapore with these and it was great. The Noise cancelling is on the cord a little annoying but not so terrible. If you bump it you get a thumping sound so clip it to your shirt.
Summary: I listen to the radio as I walk down NY City streets every day to work. I've tried mulitple types of headphones and these are the best. They are lightweight and have great sound quality. Two negatives: I've bought this same product twice and each time it has broken within 14 months; Also, the separate sound-canceling unit can be annoying to hold on to. Even with these negatives, I am going to buy another pair.
Pros: Comfortable, Easy To Use, Great Sound Quality