Dual computer in one computer case

If you only have space for one computer but need 2 systems, what about having literally 2 computers in 1?

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I might have the opportunity to test this one:

en.centerm.com:8091/show-7-2124-1.html

Since there are 2 physicals PC inside, the case is really small.

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I'm thinking about who might need it:

- For those who need 2 OS in one case but do not want to manage the risks of dual boot (accidental overwriting of data, locked partitions, impacts with windows update, etc.)

- Or for those targeting a full redundant system in one case.

I wonder...

Of course not everyone will have these specific needs.

And some may say "just buy 2 PCs".

But still, I can't help to test it :)