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I went with Comodo, but Level 3 also seems reasonable. Sorry, I wasn't checking replies.

I've been happily using NextDNS for a few months now on my mac and iPhone with no problems so far :)

I've used 4.2.2.1 extensively in the past, and never had any issues. 4.2.2.1 through 4.2.2.6 are run by Level 3

Oh, I've heard about it, but I don't like to use it because it returns a search page filled with ads for nonexistent domains.