I've had the Oculus Rift DK2. While it is a bit gimmicky - mostly due to the fact there aren't great full fledged games for it in my opinion - it's a completely different experience than playing a 2D game. It especially applies to Horror Genre games. Between having noise cancelling headphones and Oculus Rift on, it seriously feels like you're there and the immersion into the game is immediate if done right.
I literally had to take it off for a bit from being frightened of scary crap in a particular game called "Dreadhalls":
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The dread doesn't even seem that bad when you're watching in 2D, but when you're "in there", it's completely terrifying.
I only have the DK2, and newer games have come out so I imagine it's a bit better than when I played with it too. I also hear Elite: Dangerous is an AMAZING game with it, and if you're into exploring space it would probably be a must have with Virtual Reality. I know some people had played that game for hours and I may end up getting it eventually when I have time to play with it again.
Edit: Replaced it with the video he reaally freaks out with.