I just fired up the beta on my MacBook Pro (which hasn't had an upgrade since 7.10) and... wow.<p>No hardware issues, everything installed itself, even my keys light up again. Multiple monitor support has gone from being a 3 hour configuration nightmare to two clicks.<p>Far and away the best bit is the UI polish. It seems to have everything functional I liked about clunky old KDE 3.x (window shading! focus on mouse!) plus all the good bits they could swipe from OS X and Vista.<p>However I wish they would enable the dark theme by default, it looks much better than the light one. None of the review screen shots do it justice.