I just bought the full Microsoft Office 2013 for a new computer build rather than do the subscription, did think hard about OpenOffice, maybe some day
Having been an Oracle partner, I have no great affection for them, nor for what they have done to certain Open Source projects.
That said, the best M$ Office alternative is
Libre Office. Once you change the default settings so that files are saved as .doc[x], .xls[x] most users will never know the difference.
Besides the added attack vectors, there just isn't a valid business reason to get M$ Office for every machine when you can get the essential functionality for free.
