Apple's offering is $3500, and will almost assuredly be in a walled garden, the first is a massive problem on its own just because of the current existence of devices on the market that already excel what Apple is putting on the table in the same price category (the HoloLens works on SteamVR for example), but the latter is an absolute death sentence. VR is incredibly niche as it is specifically because it's so expensive and it's held back by a limited application base that's currently dominated by gaming but only with a small library of applications and games available. Apple keeps talking about AR here too, but the offerings for AR are even more dismal than VR, so I have no idea what they think people are going to use this for outside of development because there just is nothing on the AR front that's interesting that I have seen so far that would make this headset somehow worth getting. There's also the fact that SteamVR is the only reason VR has as large of a userbase as it does, even Facebook didn't lock down their Quest/Oculus line specifically because of this limited library, and exclusives on their platform hasn't done much to change that. If Apple tries to limit to just an AppleVR store, it will instantly die as a viable product, unless some corporate developers come and save it for media production or something. Coupled with the hard problems of nausea and motion sickness, I highly doubt all these issues put together are going to make Apple's VR ambitions get anywhere, unless they are smart and make it SteamVR compatible, because unlike a phone or a music player or a computer, VR's utility is incredibly small and only works under ideal circumstances and for a very specific variety of applications and a small amount of people without motion sickness.