Is it one that you just use and works just fine? Or one that has proven to be reliable and responsible if they do a mistake and only want to satisfy you as a customer?
I use them too, but have a few complaints and am thinking about switching.
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Dynamic DNS doesn’t support ipv6 addresses
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You have to have a $50 account balance to use DNS based dynamic dns
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Buggy DNS editing. (Try to create a SRV record then edit it later. It never works properly. Always have to delete and make a new one)