Sennheiser has been one of the leading manufacturers of headphones and audio equipment for a while now, and their in-ear headphones are usually and almost always some of the best I've tried.
So what's great about these? While not noise reducing like the mushroom cap style headphones, these ones, like a lot of others on the Sennheiser market, provide really good quality sound with crisp middle tones, deep bass and smooth high notes. With these I had heard parts of songs, instruments or really silent lyrics I had never noticed before. They fit in nicely in your ears and are pretty comfortable.
They come in a small, round case which you wind them around and store them in and doesn't feel cheap and tacky like they sometimes do. I have to admit that I like the small pouches other headphones come in, but this one protects them better and, and this is one of my favourite things about these cases, doesn't get them tangled. I can't imagine how much frustration I saved by not untangling endless lengths of cable.
The blue ones are my favourite, mainly because you don't get many headphones that colour and the metallic blue is really swish and quite cool, in my opinion. I'm the sort of person who never uses the headphones audio equipment like mp3 players come with and usually replaces them almost instantly. Sennheiser provide some affordable and really good quality phones.
I've had these for a year and have had no problems yet with sound quality nor anything falling or breaking, like I have with other brands in the past. I highly recommend anyone who likes their music a lot. These headphones are for those who want superior quality at an affordable price
A1+++++++++++++ - Advantages: Best in-ear 'phones ever, Produce real bass, Full spectrum sounds great for such small 'phones - Disadvantages: None, Except as with all in-ear phones thier so small I lost my pair and bought some more beofre finding them again, now I have two. If only I had four ears!