If you stream your music from a Computer based source, you'd be surprised how much an outboard Power Supply can lower the noise floor and add great dynamics to listening....especially through some quality Headphones. A lot of fine electronics put their power supply in separate boxes....
R-I-G-H-T
1) Is the improvement measurable?
2) Is the improvement audible, with normal double blind testing protocol. If not DBT, then human bias is at work (ie "I spent this much $ so I expect it to sound better, thus it sounds better").
I do agree that for using a computer for streaming, I prefer to get the signal outside of the computer chassis in the digital domain, then do my D/A conversion--again this is simply because digital is orders of magnitude more immune to noise than analog signals (and inside a computer chassis is a noisy environment). I will make a couple side-notes here--I avoid audio over USB connections if at all possible as it is a lousy connection all around, and the entire "Asynchronous Streaming and Jitter" mumbo jumbo is purely marketing.
What I'm telling you is that most of what I'm seeing from that company is very dubious to actually yield audible improvements. Furthermore, there is a lot of "information" on his website that is absolutely questionable. If you can't convince them with facts, then confuse them with technical jargon.
If that is how you want to spend your $, then that is your decision. But, for my $, I would instead take that $ and spend it on BETTER SPEAKERS or Room Acoustic Treatments--areas where that $ is GUARANTEED to get a significant audible improvement.
I know a thing or 2 about building electronics and putting beastly power supplies in a separate enclosure
Exhibit A, be sure to go to page 2 and posts #24 and #25
http://forums.audioholics.com/forums/threads/new-chipamp-project-thread.92513/
And, I know a thing or 2 about audio streaming.
Exhibit B
http://forums.audioholics.com/forums/threads/raspberry-pi-audiophile-streamer-kodi-streamer-arcade-cabinet-etc.103967/
If I think I want a hot-rod power supply (want being the key word, not necessarily need), then I go the DIY route.
EDIT:
I'm re-posting this comment taken from their website. This is 100% false! That is a huge red flag to move along and not give them any of my $.
A computer is made up of billions of transistors all switching on and off to that square voltage created by the power supply. Any noise on that power supply does the same exact thing to digital as it does to analog, except much worse
Better info on digi signals:
https://answers.yahoo.com/question/index;_ylt=A86.JyTCEpFXjFcAS4cnnIlQ;_ylu=X3oDMTE0NXE2Z2I4BGNvbG8DZ3ExBHBvcwMxBHZ0aWQDRkZVSTJDMV8xBHNlYwNzYw--?qid=20080212230537AAkuE2c&p=what are the advantages of digital signals over analog signals