Hmm... I like iWorks! It's funny, though: Office 2008 apps take a LONG time to open, but once open they're responsive. iWorks opens more quickly and is responsive as well. However, Office apps barely touch my CPU but leave only about 80MB of RAM free. iWorks, on the other hand, pegs my CPU to about 90% used and leave me with 180MB 70MB of RAM free... If I could figure out how to start up Office apps more quickly I'd be content with it. Right, off to google that now...
Just to note, though - iWorks is visually stunning, even on my old computer with no fancy graphics capabilities. Just how underpowered the graphics card is was driven home for me yesterday when I decided to show my parents some of QuickSilver's (great, this post script gets this post on topic!) power. On my iBook when I open Quicksilver for the first time I get the QS splash screen. It's innocuos and pleasant enough, but that's as far as it goes. On my parents' iMac, wow! The QS sort of emerges, shimmering, as if rising out of perfectly still water... I don't really care about this, but did *note* it!
EDIT: changed iWorks' reported RAM usage... I ran this test four times for each suite using the same xlsx file and checking usage with iStats Pro (under Dashboard). To make this test really valid, I'll have to restart the computer between each usage of one of the suites... As one might perhaps expect (at least if one is approaching this from a Windows background), opening Excel was much more brisk the second, third, and fourth times, though I did ensure that it wasn't running when I had Numbers running and vice versa. Because I am running iWorks as a trial AND it has to convert Office 2007/2008 document formats before opening them, I am not concerned with its load time.