OO.o Calc sort-of compares with Excel 2003, i.e. it's not quite as good but given the price (free) and the level at which most people make and use spreadsheets,

OO.o Calc sort-of compares with Excel 2003, i.e. it's not quite as good but given the price (free) and the level at which most people make and use spreadsheets, it's Good Enough. However, it seems pretty clear from the Excel / Calc comparison video that Excel has moved far ahead in power (watching it, I noticed that they seem to have fixed a lot of the pain points I currently have with Excel '03) whereas Calc is still stalled. Disclosure: I use XP/Office 2003 at work and Ubuntu / OO.o at home.