How much?! $55? Over here in the UK its £109, thats about $190!! What a rip off country I live in...
Anyway, I think its worth it, not for word or powerpoint, as I find pages and keynote to be on a totally different level, they are fantastic, but for excel, as it is the best spreadsheet program I have used on mac. I have office and only use excel because keynote + pages are so much better