I'm really looking forward to this. Unlike iOS7, the flatter design here doesn't make me feel like a bunch of amateur artists got a hold of a free copy of Adobe Illustrator. I actually like the new look quite a bit. Now, to pray that they've made some under the hood progress on multi-monitor support.
Moving work back and forth from desktop to mobile also sounds really amazing. I get a hint of it when working with gmail or drive, but this sounds much more deeply integrated. Google will have to respond, and this makes me happy.
* when you fullscreen a window, there's a white (sometimes black) bar where the menu bar used to be
* app switcher changes monitor depending on the monitor you last used the dock (which makes no actual sense).
It's "better" in so much as I can full screen two things now instead of looking at a useless monitor full of fake fabric.
I also have two spaces and things don't really quite work right. I'm not quite sure how to make it work better, but it almost never does what I mean right now.
Moving work back and forth from desktop to mobile also sounds really amazing. I get a hint of it when working with gmail or drive, but this sounds much more deeply integrated. Google will have to respond, and this makes me happy.