I have switched from OpenOffice to LibreOffice. I was interested to see what all the fuss was about and from what I have read I see that the most interesting developments will happen on LibreOffice and OpenOffice will be left as an Oracle application.
So far I have been very impressed. It is fast and everything seems good. I run Arch linux and installed the standard packages. The only issue I found was with spell checking. The standard spell checking packages would not work for me so I have installed hunspell (pacman -S hunspell-foo where foo is your language).
I can only recommend switching.