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I never had downtime issues with Dyn, and the performance was satisfactory. But I tried talking a coworker through updating our TXT/SPF record and told him he'd have to "stumble around until he found the right interface" - at that point I realized we deserved better.
Amazon Route53 is just ridiculously easy to use. Also, machine-controllable. Not as good as shadow primary, but second-best option and saves us so much frustration just doing stuff.
Though if there were someone who was as non-sucky to use as Amazon, I'd be interested too.