I used OO a bit in the past, but never stuck with it, I noticed it wasn't as fast as it's expensive protege..MS Office. Granted, it's free, instead of $100 or whatever, depending on your discounts and such.
A benchmark was run between Office '03 and OpenOffice 2.0 on creating and loading files..and OpenOffice clearly has code that needs to be optimized, but again, it's a free program.
Article and benchmark diagram here:
http://blogs.zdnet.com/Ou/?p=119