John Olinda Hmmm... well uninstalled Homebrew to check out Yosemite, the visual changes are surprising to say the least.

Martijn I'm still on the fence. Is it worth the update? I am way too dependent on Mail and Calendar for Yosemite to mess them up.

Mark Dain Little Snitch has had quite a few updates but I think it's worth waiting for 10.10.1 although if you take a Time Machine backup, you can restore from that.