Quote: I personally prefer Etymotic ER4. I also prefer a number of other IEMs to the RE272, including their less expensive brother RE262. I found RE272 sound somewhat lacking in definition and they also don't image very well. With RE272, I could hear lots of detail, but had a hard time identifying where exactly many sounds were coming from in the soundstage. Some people are OK with a presentation like this, but in my case, it makes me lose focus on the music which I find frustrating since I usually like to listen carefully and to analyze what I hear. The soundstage also lacks depth with RE272 - it is quite wide, but there is little forward projection. RE262 suffers from similar issues, but to a lesser extent - I find RE262 sound a little more defined and three dimensional. Personally, I favor the sharper, clearer, more precise sound of good single driver balanced armature IEMs like Etymotic HF series, ER4 and Phonak PFE, although balanced armature designs have their own issues, such as a lack of natural uppermost treble extension and treble smoothness than the good dynamic drivers are capable of. Armatures also tend to lack some depth to the sound, but can make up for it with very sharp imaging and great separation of sounds.