No, I haven’t installed it yet (since Final Cut is working at the moment, I’m going to wait a few days… never be the first to upgrade a production system). However, this caught my eye from the release notes:
Resolves an issue in which switching to a different space and returning back to the original space may reorder the application windows with a different active window.
Sounds like Spaces might actually be usable now. Yay.
Keep an eye on MacFixit over the next few days. Bearing in mind, of course, that MacFixit seemed to be inhabited by people with the sickliest Macs known to the web, and ‘Dooom! Dooooooommm!’ is their default experience of software updates.