Hey,
My main point is that the audio can be optimized for GAMING for quality gaming headphones. I'll let the reviews explain that..
It's important to review this headphone specifically and not compare to all 7.1 solutions. These are STEREO headphones with an addon USB feature to support a virtual surround option (and volume). You can use it or not. Maybe in some games you care more about footsteps and this feature helps.
I'm guessing you also want a MICROPHONE as well?
The 3.5mm jack plugs into the USB control cable which in turn plugs into the computer. That means its a DIGITAL signal into the USB which means there is a sound card to convert digital to analog in that cable.
(USB also means some isolation from the computer's analog noise which may mean less "hiss" or other issues. Digital data is the same. It's only when converted to analog that we can get distortion from the rest of the computer.)
Other:
7.1 a gimmick?
First, you do NOT have to use this. (but I agree 7.1 isn't necessarily any good, and often worse)
There are two, physical drivers only. The 7.1 is optional, so this is NOT like other headphones that use multiple drivers.
Video (Jayz2cents):
https://www.youtube.com/watch?v=UiIwNJuVmoU
http://gaming-headsets-review.toptenreviews.com/kingston-hyperx-review.html
http://www.trustedreviews.com/kingston-hyperx-cloud-ii-review
"Although the Kingston HyperX Cloud II only costs £75, you’d be hard pressed to find a better-sounding wired headset at any price. The stereo sound is powerful and detailed, with the 53mm drivers providing plenty of punch in the low-end, while also being sprightly at the high-end. The headset is most suited to video games, but it’s impressive in movies and music too."
*The extra audio processing to isolate certain sounds is optional:
"However, Kingston’s version sounds just as good, providing an accurate approximation of where things like bullets, footsteps and grenades are coming from. We personally didn’t use this feature after our review period, preferring the clarity and overall quality of the stereo output, but the option is there if you want it, and it’s as good as any other surround sound technology on the market."
Summary:
Again, these are quality, STEREO headphones with optional optimizations for gaming. They can be used without the USB attachment as stereo headphones like normal.