After several days of test (I received the IBM info letter last week), I find IBM Lotus Symphony a good work, quite fast, very mac-like style. Seems to better preserve original formatting of .doc and .docx files, imported Nisus rtf files very well, including headers and footers.
The problem with this build, as well as the already numerous OO, LibreO, NeoO variants is that we already have TOO MANY offices for mac, to add here iWork and, of course, MS Office for mac. This may prove confusing.
I understand Lotus symphony will merge with OO 4. This sounds good, if OO 4 takes this interface, and improves it, then make a jump in speed, then this may be indeed a great step forward.