On my C1000, running via debian on XQT open office is painfully slow to start up. You can type inside it at a reasonable speed inside the writer application. If you move from cell to cell within the calc application, there is a slight delay. Opening and saving documents has a very noticeable delay. The menus and option windows are pretty slow.
I think the way it has been installed is partially to blame for the speed, mainly because it's on an SD card, in some sort of virtual file system and I'm not sure how much of a hit the system is taking for running X windows and debian within Qtopia in the first place.
I would be willing to bet that if it were run natively within pdaXrom, it would be a bit quicker.
However, the speed really doesn't faze me. I can now open all my openoffice documents from my Mac without having to translate them first or bring my mac with me where ever I am. It's great, I'm happy, it's a big step forward for me!
I liked my flirtation with pdaXrom, it seemed (to me) the most exciting rom I've seen so far. With openoffice the next release would be awesome!