Basecamp in particular is usually running on near-edge Rails, so we have at least one big production app to find out things.

"Agile Web Development with Rails" also does CI against edge edge Rails, so that's being checked at all times too.

I'm not going to say there's a ton of production apps using latest, but there are some, at least.

The release cycle seems to be extremely clean these days, thanks and congratulations to you all.

Thanks. Decisions were recently made to specifically make it easier to upgrade, even when it's worse for us: I removed a feature that we later reverted, for example. So it's nice to hear that it's appreciated. <3