What this app offers: The Virtual experience to hear sounds as if you are in the room. Ok, perhaps there's no much use for this other than that, but I can see this technology productively used for other projects. What I got: AMAZING experience. Using the headphones, not only do you feel you are in the room, but it sounds as if the sound is literally coming from the corner of the room, or wherever you place the four speakers. I always wondered how, while listening to music in headphones, different instruments seemed to come from different positions. Perhaps they use something similar to this to test it out and make those virtual effects? My conclusion: This app is free and it does what it says. I think the experience it offers is more than worth it, specially for audiophiles (sorry spelling may be wrong). I would love an app like this, with the addition that I could create virtual sounds or music, even if just for relaxation.