I certainly didn't know it existed until now (though I was aware of the book in no-trees-were-harmed form) and we are currently assessing our ongoing needs regarding version control (it works, but we really need to move onto something more modern at some point soon), so they've at least bought a little mindshare here, and I doubt we are at all unique in that regard.

It'll be interesting to see how this works out for them if we get a follow-up article further down the line.