This is an outstanding adaptation of OpenOffice.org to OS X. It looks clean and Mac-like (except for the Preferences looking a lot like OO.o, but there's only so much that can be done). The developers and the NeoO community are outstandingly helpful. I use this every day at work for writing reports and spreadsheets. I have to share them with Windows/Office users and thus has been seamless. It does feel a tiny bit slower in use than Office apps, and it takes longer to launch, but other than that it is as good as anything out there and better than most.