Looks awesome, but only an "experience" rather than something you can buy? I guess it would need an ultra-beefy system to run it, and is probably extremely expensive and not supported by much software (yet).

They run it for you - it is a capture service. https://www.lytro.com/immerge#immergeDetails

We're talking about two different things. Hallelujah is interesting because it does light field videography, but what I linked was a light field display.