As someone who uses Nettica for Dynamaic DNS (which this seems to be targeting) I think it's great that Amazon is creating some competition in this area. Not enough web developers consider Dynamic, programmable DNS and that's a shame because I think it's a must. I monitor every site I have from an external location and if there's ever a host outage I have the DNS re-routed to a backup host within 10 minutes (it doesn't always propagate as quickly as I like but there's little that can be done about that)
I'm happy with Nettica but Amazon's offering will draw attention to this important point. Plus competition leads to more features, better service and so on.
What do you set your TTL to? Do caches actually respect it?
(My experience with this is that the downtime that I want to route around usually lasts longer than the TTL. And even if it doesn't, the recursive resolver / OS cache / browser cache ends up persisting the record longer than the TTL advises.)
Actually they don't but in the opposite direction. I set it at 7200 initially just to see if it would work and found not only did it work but updates came even quicker in most cases. Google's DNS for example will update after about 10 to 20 minutes regardless of the TTL setting.
I'm happy with Nettica but Amazon's offering will draw attention to this important point. Plus competition leads to more features, better service and so on.