I think that the most important part of the office suite will be its interface; as an (ex) user of docs to go on a palm platform I must say that it fits well the handheld, so I think it could be a good solution even if it requires a small fee to use.
Openoffice in a debian chroot don't seem too much usable without a complete redesign of the user interface ad hoc for maemo.
Now I have many expectations from koffice 2.1, but I still didn't find any screenshot or video of the full editing suite... there's plenty of videos of the viewer, but it's not what I (and other users I imagine) need as now...