GNOME office is quite unstable too (Gnumeric especially)
I don't know what the fuck is up with those guys - I have reported numerous gnumeric crashes, and they haven't done anything. It's like gnumeric has been abandoned. Which sucks, because I liked its interface and functionality better than OOCalc.
IMHO AbiWord is the 3rd greatest word processor of all time, in my opinion (after WordPerfect 8 and Mariner Write). No spreadsheet will ever trump Quattro.