There's a certain arcane field of psychology that holds that our fondest wish is to return to the safety and comfort of the womb. I think the folks over at Spherex are adherents, because their RX2 media chair is a lot like floating in the placenta. Except the warm fluid is replaced by ear-piercing sound waves.
I had a chance to test out the RX2 at this year's CEDIA Expo, and I can verify that it's definitely an immersive experience. The haptic kick is nice and strong, and the 5.1 surround sound system is way loud. (There are 5 OMNIPOLAR satellite speakers embedded in the upholstery.) You sink back pretty far in the seat, too—anyone under, say, 5-foot-5 is gonna need a hand getting upright.
Though the RX2 was announced back in August, it still doesn't appear to be available. Nor is there a suggested retail price. Methinks that if you have to ask, you can't afford it.
Spherex RX2 Media Chair [Spherex Inc.]