Summary: I gave up on the Bose Quiet Comfort 2 after having 3 pairs break. I had read several positive professional and user reviews regarding Shure earphones and decided to give the SE420 a try. I have used them for about 3 months now in the office and on airplanes, including long-haul flights.
Summary: These Shure earphones have two drivers in them. They sound very good. They are full and rich everywhere, but just a little lighter in the bass department. For more bass, get the Shure 530 which has three drivers: one treble and two bass drivers. I also have other earphones like the Klipsch Image and others that have one driver in them. I also really enjoy the lighter sound too.
Summary: In a nut shell, the ear phones did not fit comfortably in my ear canals. I could never be sure I was getting all the bass response they were supposed to deliver. I'm sure they will be great if they will fit in your ear canals. I would suggest buying them from Amazon because you can return them without hassel if they don't fit.
Summary: I am a production sound mixer and absolutely love these. It's important for me to hear only what I'm mixing and no external noise or any "enhanced" frequencies that aren't going to the recorder.
These sound very transparent and do a great job at sealing out external noise.
My favorite attachments are the round, gray rubber ear molds. They have the best noise cancellation to comfort ratio.
Love the "over the ear design" for the cable.
Summary: If your an audio enthusiast that only demands the highest quality of audio sound, you will definitely love the Shure SE420 Earphones. At around 220 euros, most people might think money waisted, but for the audiophile its money well spent because of its high end luxury design and awe inspring sound that it produces.
Pros: Excellent audio reproduction, high end quality design