Thought I would prefer Mavericks because of what they have done with the multi monitor support... I'm not sure though.
I can't seem to get my Vmware fusion to expand across both screens now though.
I can have my laptop screen and a monitor. Laptop is full screen Safari for example and monitor is full screen Fusion, I then can 4 swinger swipe on my monitor back and forth between Fusion and another Mac screen.
I'm finding it to be a bit slower, especially when loading the lauchpad, this is very slow.
Strange few issues as well I'm having such as not being able to click at the top of the screen, the menu bar or whatever it is called.
Kind of regret upgrading, if I can get Fusion back on both screens I'll be much happier again!