HTC is partnering up with Bethesda to give you a nice freebie if you buy an HTC Vive. For what I am assuming will be a limited time, you'll be able to get a free copy of Fallout 4 VR with a purchase of the Vive.
Fallout 4 VR will be coming out in on December 12th, 2017 which will be the entire base game in virtual reality. No word on if the DLCs will be coming along with them later on down the road, but I would be surprised if they didn't.
As a big Fallout and VR fan, I'm anxious to get my hands on this one and see how well Bethesda did at converting the game to utilize a VR HMD. Word has been mixed coming out of folks who have tried it, but we recently learned the demo was using a 3 month old build so maybe, just maybe, Bethesda's keeping back some surprises for us.
$599 will net you the HTC Vive currently so if you're on the fence on whether you should pick one up or not, Fallout 4 VR is a nice incentive to do so.