[echoless]

> I'm always slightly bemused at how quickly people feel the need to rush into the next operating system.

The difference with this release is that it's a pretty big UI overhaul and some developer features such as storyboards for Mac aren't available on older versions. People who develop for the Mac or iOS have little choice but to upgrade.

I've been running Yosemite since DP 1, and haven't had any major problems yet. There are minor annoyances, but on the whole, Yosemite's feels like a step up over Mavericks(after using it for a little while). Although I should mention that I have a pretty beefy computer with 12Gigs of RAM and a decent graphics card.