I have been using these for a week now, and have listened to all manner of music through them, from orchestral, to pop, to jazz, opera, choral, rock... and they have performed exactly as I had hoped they would, which is to say they play back any track exactly as the producer in the recording studio would have heard it. Every detail can be heard in any genera, so if the music calls for bass, they will provide!
The noise reduction is effective, although don't expect the same "cocoon" effect as noise cancelling headphones can give. These will block out enough everyday traffic noise to allow you to listen to your music at a low volume and still notice every detail, but at the same time you will (most likely) be aware of outside noises.
My only word of warning is that changing the ear buds can be very fiddly, but you only really have to do that once. All in all, an excellent product.