There seems to be a lot of positive comments, so let me state that I am rather underwhelmed given the hype. I listened through a pair of Audeze LCD-4z headphones and Shure SE846 IEMs. The content was a mix of video games, demo material that I frequently use with my home theater, and some music. The source was my PC. Interesting side note: Kodi on my Android tablet crashes when I start it with the amp plugged in. I have two main complaints, both of which I have with nearly every HRTF solution I've tried. The first is that I can usually establish sounds as coming from the front or even the side, but never from behind. I was optimistic that the head mapping might fix this, but that was not the case. The second is that there's a definite artificial quality to the sound, but the extent of it is not always consistent. There are times when there is excessive reverb/echo. Some of the reviews available online complained about this with vocals and voices in music. I agree, but I've also noticed it in games when sounds don't have a well-defined source, like menu sounds or dialogue. There were a few other times in games where I noticed excessive reverb/echo where small shifts in my in-game positioning would make it go away; given a statically positioned sound source, I could rotate or reposition myself with respect to the source to hear the reverb either become excessive or go away entirely. Overall it seems like another decent option with its own set of drawbacks. I've yet to try anything that I would state is definitively better than everything else.