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Installed em both... and OMG, iCal IS faster! About time... well, it still displays Jul17 as date before you start it... can't they fix that? But one good thing I noticed: The weeks now really start with Monday when you set it in the preferences, even on the left side!
 
Having a huge problem with iSync though...
I selected the option 'show iSync in menu bar' in the Preferences, and all of a sudden, I saw that spinning wheel thinngy (the one that comes up when you shut down) on the middle of my screen, everything was quit (including the Finder) and restarted... basically, I was logged out and back in right away. But still, no iSync icon in my menu bar....
 
Better all around

Much quicker UI response time from the application and I love the new looks of some things. Makes me happy I own a Mac.
 
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