domain name system - When do I need an own DNS server?

Note: I realized belatedly that this is a duplicate of question 23744, which already has good answers. I couldn't close this post for lack of reputation, maybe someone else could step in.

I use hosted servers for my company and although I might opt for colocation of more customized machines in the future, on the whole I'm not too keen on diving too deep into "datacenter business". So generally, I would like to leave the handling of my infrastructure to dedicated pros as much as possible.

Recently, I've been starting to lust for some more flexibility regarding the DNS entries for my domain and have looked into running my own name server(s). It seems to me that running a professional, failsafe name server is a little more effort than I'm willing to commit to just now. Still, I like the idea of having a lot of control over it.

For a more experienced Sysadmin, what are indications to run own name servers? And when using name servers that are professionally maintained, what self-administration options are advisable to look out for?

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