The current OpenOffice version available for mac is old (1.0.3 I think) and the port is still in beta testing. It is mainly targeted for Unix savvy people who like to experiment with it. GUI integration with aqua isn't as good as it could be (runs under X11). Unfortunately the project doesn't seem to be advancing at all (or is advancing very slowly).

I'm using version 1.1.0 on my Linux desktop and I'm very pleased with it. It looks better than 1.0 series. Most bugs have been ironed out and start up time has been reduced to tolerable level. It's sad that OS X port is so badly lagging behind Linux and Windows versions.

There are projects for porting popular Linux/Unix GUI libraries (GTK+ and QT) to run directly under OS X's graphics engine. That would allow easy porting of KOffice office suite and other Linux apps to mac.

I'd still assume we won't see a free production quality office for mac until year '05 or '06.