I was looking at their Kickstarter a couple days ago. I am interested but I don't have the money to help them out, certainly not enough to secure me my own set.
I stumbled upon them. I remember hearing about something like this a while back. They've combined everything. Surround sound (around the head), impact force, vibration, and sensation (ie: electric workout machines for rehab / lazy people who want to think they have abs).
To be honest. This unit, plus a Delta Six gun, plus a Virtuix (sp?) Omni treadmill (lookup the TF2 footage, it's pretty cool), plus an Oculus rift = FPS virtual reality win.
If they couple that with a realistic shooter like Ground Branch or ARMA3, and that could be a milsim wet dream.
Guaranteed PTSD or your money back.
I'd still filter the subwoofer through my HT sub. Thing shakes the whole house on explosions and gunfire. I always show the new Bourne movie around the shack scene to people as a demo.