I considered Perl 6 for a deep dive at the end of 2015...just as it was 'officially released'. The difficulty for me was the state of the documentation ecosystem. No dead-tree books (but for one that was written more than a decade earlier) and a lot of information ad hocked up in blogs and slides. I just felt like I could not really get a handle on it...While googling 'Perl 6' sort of worked, 'Perl 6 how do I <x>' type queries pretty much ignored the "6" and landed me on Perl 5 resources. Perl 6 still only has ~300 StackOverflow questions.

I'm still interested in it, but it just doesn't work for me as an ecosystem yet.