Closest thing to virtual reality i have ever felt was the Trimersion HMD controller. The way it was set up made it feel so real, and I am sorry, but nothing feels as badass as being the master cheif and gunning down a group of grunts. sadly, the company died (confirmation on death of 3001 AD?) and the product is expensive as hell (it was my friends that i used), but they had something that I hope to be the start of what would eventually turn into a true cyberspace. I plan to get a new laptop here soon and FEAR 2, so i will look more into the Trimersion just so i can see how long it takes for me to piss myself from alma or a spirit of some type.