Am generally liking it, but definitely having to get used to a few things.
Its weird that the scrolling is reversed, although my brain had never really noticed that it has until now been the opposite of how its done on the iPhone.
As someone who used and liked spaces and expose, mission control seems to have lost a little of their functionality.
Expose was great in that you could see all open windows in their entirety, even if they were shrunk a bit. When vista came along, the flip 3d thing was all very well, but it struck me as less useful as you had to go through the windows in turn rather than see them all in expose. so its a shame that MC has adopted this idea of stacking windows of the same programme together.
Old spaces had advantages too - you could fire up spaces, and simply drag windows between them. plus you generally had a larger view of each space to see what you were doing.
In MC you can't seem to move windows between spaces, but rather you have to first select your space as the main section, and move windows to the spaces in the row above. not quite as good i don't think, although once i got the swipe to move between spaces, that at least makes it pretty quick and easy.
So i think i'd like two options to be made available:
1. Be able to use a shortcut or gesture to whoosh the spaces into their old style grid layout and let you freely move windows between any two spaces without first having to select the space of origin.
2. Be able to view the expose in the old manner without the stacking.
Oh - and also be able to freely order the spaces at the top, rather than just have Apple's two options.