Did I read correctly? "Upgrading from previous versions won't work to 13.10 (and probably not to 14.04)."

Do you know if keeping /home (as a separate partition) with a fresh install of Ubuntu Gnome will work, or is it necessary to make completely fresh install? And what kind of hardware (how old hardware) can run Ubuntu Gnome reasonably well? I'm thinking of speed as well as hardware drivers.