I've always been wary of NeoOffice on a purely emotional level - lots of bad vibes re: their splinter from OOo but push has come to shove now and it's bad news for OOo. 3.0-3.1 was their big splash Mac native version, but it doesn't behave well for me... when dealing with even the smallest of graphics in documents (tracers when moving an image, a delay in image rendering from the time you release the mouse button until the image appears in its new position, makes precision difficult). It opens slower than NeoOffice. I get too many beach balls (even if OOo is the only app open and the first one loaded right after start up, so not a memory or CPU issue on my computer).

NeoOffice doesn't have any of those issues.

Yeah document format exchangeability is still buggy, in both Neo and OOo, but that's actually now Microsoft's fault - they (seemingly) purposely withheld the appropriate specifications to allow interoperability seamlessly after agreeing to a standard to use, using the excuse that the standard everyone agreed to was not well defined. But M$ only brought that up AFTER the fact when it was too late to fix, when they supposedly knew about it during development.