I've been using NeoOffice since it's early days (and my early days on MacOSX) :).
OpenOffice 2.x was often very slow and didn't seem to integerate into MacOSX very well.
I really liked NeoOffice, the much better interface, sometime/usually faster, the more Mac-like-feel and integration.
3 years ago, after NeoOffice wanted to get payed for the newest version, i gave LibreOffice (and OpenOffice) a new chance to impress me and i was amazed about the developement on this Office Suite.
First version 3 looked much better and worked like a dream, not a nightmare like before...
No costs, a much better interface than before (compared to old OpenOffice 2), much better perfomance and stability.
For LibreOffice, i can say, they've done their job, to bring an Open Source Office back to Mac.
What brings me to leave NeoOffice where it is today?
The version of OpenOffice, that the developer of NeoOffice used to make their "Mac-costomisation" was old (version 2). Even in their latest version there are bugs, that came out of OpenOffice 2.
They never updated to the latest version (3 and 4) of OpenOffice/LibreOffice, therefore missed features and security updates, import/export-filters and seem to be more interested in selling the old NeoOffice, that they made years ago.
They costomized OpenOffice and now don't find the way back to actual developement in these projects.
Take a look at the development history of NeoOffice and you will see, that there isn't much. OpenOffice/LibreOffice had 2 major versions and hundreds of updates in the same time.
Should i really pay for that? No, i do not.
I can't (after my comparison with LibreOffice and 3 years working with LO and NeoOffice in parallel) recommend NeoOffice anymore, even if i was a big fan of it years ago...