To understand and compare the differences between the headphones/iem's I own, I usually listen to "Virtual barbershop".
May be some of you already know this binaural recording, but I wanted to share anyway...
You have to close your eyes during listening. This is very important.
Your brain will start to locate each sound and even start to visualise the scene...
I can say that VR-07 does a perfect job while listening to this recording. I am really impressed!
(Regarding sound-stage and locating instruments, It is not better than my K340 electrostatic-dynamics (and I don't expect them to be
, it is very close - or even better in some ways- to my KSC-35, it is certainly better than all of the iems that I have owned or tried before...)
Link to the high quality recording is here:
http://www.4shared.com/audio/nyXJ23u9/Virtual_Barbershop.html
(just hit the play button, don't forget to close your eyes