Of course the proof is in the hearing.
Sorry you missed hearing it at CES last week.
Here is one of the many positive reviews...

"The result is uncanny, if not quite perfect. I tried a little "Call of Duty" action with the Psykos (gotta love the name), and for once, I had the sense that the screams, gunfire, and explosions were actually coming from behind my head—much better than the gimmicky surround sound I've heard on other headsets"
http://tech.yahoo.com/blogs/patterson/32951

Of course I list a positive review, there are lots of them. The only negative comment we've
heard from one review site was that Psyko could use a bit more bass. We know that bass
actually interferes with determining the direction of sound, but we hear the comment
and will work on it. By the way, the amp that we include with the headset allows the user
to adjust the bass level.

We have lots of people tell us their game score goes up by using Psyko headphones because
the directionality of the sound is so precise.
Get more info at our site http://psykoaudio.com/

This is the Head Psyko at Psyko Audio. I'd be glad to answer any questions.

First, about the left and right signals:
If you are thinking about the traditional headphone methods, consider that the multiple driver method puts right sounds only in your right ear, left sounds only in your left ear. That doesn't seem like a big problem, but there are a couple of problems with it. First, the psychoacoustic research says that if you play a sound in only one ear it sounds 6db quieter than if the sound is delivered with the correct timing and volume delays to both ears. Every sound you normally hear goes to both ears with those timing and volume differences. The psychoacoustic research even has a term for the effect of traditional headphones - it is called in-the-head-fatigue syndrome. That is the effect that many people feel after using headphones for a while. Their brain actually tires from trying to figure out the direction of the headphone sounds that don't make sense.

Psyko's headphones play every sound with the correct timing and volume difference to both ears. Just like being in a room with the sound.

Second: about perceiving front and rear sounds.
The way sounds are perceived as being either from the front or the rear is due to how the sound reflects off the outer ear. Since every ear is unique to each person, just like fingerprints, that means every signal at the ear drum is unique to each person. The DSP methods, like Dolby Headphone, deliver a single signal. It is like one pair of prescription glasses for everyone in the world. If your prescription, or ear shape, happens to match the DSP algorthm it sounds good, but if your ear shape is outside that algorthm it does not sound natural.

The Psyko method provides a sound flow from the front and from the rear of the ear and reflects off the ear to create the correct signal at your ear drum. Plus Psyko's method results in no latency because there is no DSP, no signal processing.

There is lots more info like this the independent site that is dedicated to headphone audio
http://headwize.com/tech/index.htm

Head Psyko from Psyko Audio Labs here.

I'd be glad to answer your questions about the Psyko 5.1 headphones
except this week I'll be pretty busy with showing them at CES.