First impressions are good though. OOo Aqua looks a lot like NeoOffice. There is still of lot of areas where OOo Aqua is lacking behind, but the improvement from the X11 based OOo are definitely noticeable.
The application is much faster than the X11 version and feels more like a Mac application than X11 application. If any of you tried running OOo via X11 on a Mac you know what a pain it is :-/.
My shallow experiments showed that OOo Aqua uses only half of the memory compared to NeoOffice. If the stable release will keep this feature it will be a huge improvement and a slap in the face to NeoOffice.
Some users claim that the alpha version of OOo Aqua is faster in certain areas than the current NeoOffice (see this in-depth review). I didn't notice a big difference between the two, except for performance in window resizing where NeoOffice is faster (but still terribly slow compared to any other Aqua application).
Overall I'm impressed about the results of only a few weeks of active development since the project announcement in the May. OOo Aqua developers keep up the good job!!!
(If you ever wondered why OOo Aqua and NeoOffice are two very similar projects that run in parallel, then here is a couple of answers that shed some light on this situation)