>>273677447
The current state is that the hardware is alright, but it still has some kinks you might need to work around or troubleshoot or get customer support with. If you're fine with that then it's worth getting. The games are getting better and better, with more coming out.

From what I've seen, no infographic so far has gotten things right and actually helped people make accurate judgements. You'll just need to do your own research about each, and ask questions. Generally we now only recommend to people the Samsung Odyssey+, Oculus Rift S, Oculus Quest, or Index, depending on your budget, what you'll be doing with the headset, and also depending on what your IPD is. 

As far as how the tech works and sources, I suggest Googling Michael Abrash, and read his stuff from when he was talking about AR, at Valve (he should have some blog posts about that), then go watch the talks he did after then, but before he joined Oculus. I think he talked at quakecon, or maybe Valve Dev Days. And then after he joined Oculus, watch all of his talks, the ones at Oculus Connect. Also for a bonus, watch Carmack's talks as well. And also watch this kind of legendary/prophetic interview with him https://youtu.be/GVDXXfbz3QE?t=719