[AmericanChopper]

>There's a lot of myth out there about upstream DNS resolvers not honoring low TTLs, but we find that it's very reliable

I've done a few unplanned DNS failovers, and I agree with this. What can be real trouble though is if you're running a B2B app, and your customers corporate networks can be configured in any strange way. I've met real network admins who think they need to have high TTLs everywhere in order to protect themselves from root DNS DDoSes.

[nh2]

There really are locations where DNS resolvers don't honor TTL.

For example, the public wifi in the last Hackspace in Munich I visited did not honour my 10 second TTL.

But in my opinion there aren't enough of them to justify not using short TTLs. It's their problem after all if they don't honour websites' settings: Then they will see downtime when nobody else does.

[voltagex_]

Do you mean it was cached for longer than 10 seconds? Was it Freifunk? It might be worth writing to them to ask what their caching setup is.