This feature, along with so many of LION's gimmicks, is dreadful.
I have been using LION now since it's release.
In my personal opinion, all these new features are a waste of time, dramatically reducing output, workflow, and productivity.
I can understand that touch-pads and phones need alternative interfaces, that's agreed, however lets not sacrifice the desktops productivity and intuitiveness.
Safari, appears to behave slowly and exhibits poor overall performance, scrolling is slow, blurry and jagged, and the rubber band space at the top/bottom of the page is annoying.
Folders appear to rearrange themselves, and lose any view options set by the user. This is an obvious mistake, and demonstrates the software was released without sufficient checks.
Full screen apps, come on, that feature sounds great, one of my reasons for buying Lion, but the final execution is appalling, i just can't see the benefit, they should have called it, 'Bar at the top of the window removed'.
Reverse scrolling, what were they thinking, seriously, was that a joke?
New calendar, no change there, fake leather appearance.
Mail, looks great, but no real change from previous SL.
Autosave, Pages, freaked me out initially, but appears to be a good feature.
Anyway my overall impression of LION is, it's slow, it's buggy, it's rubbish.