This seems like a solution looking for a problem.
Quiet PCs are great, and most of the early ones were completely quiet. But, for gaming? It's not as clear. For the same performance I can save a load of money, or get much better performance for the price.
For listening to Mozart's g minor string quintette? Great. For blowing up bridge or shooting aliens with a machine gun? I'm just not sure sound matters as much. For a living room box that does most things fine, and is quiet, I'll take a 35 watt Kaveri, and still have enough money left over to make a more powerful machine than this $2600 monster.
I also don't understand the relatively cheap processor. For $2600 (which is what the ad says, but the author never seemed to mention, so it's hard to be sure), the processor should be the i7-4970K. Haswell-E might work too, but probably the 4970K would be best.
Someone is going to want this, but I think it's very limited in scope. Silence, or near silence, is great for computers, but for different segments. Most gamers want performance for their dollar, and this falls short.