Re: Doubly unusable if he moved the document
Hmm, I've been using LibreOffice for years on OSX (more to do with the fact that it makes it possible to edit on OSX, Linux and even Windows without many problems). My main challenge with Word was that it utterly screws up the formatting of a document when you try to import something - and this even happens when you get a Word document coming from a PC.
Now I am a content guy, but when you're finishing you eventually move to formatting and in the end we just started using LibreOffice everywhere.
Even if you have Word on your machine, work in .doc format. Once Word starts rejecting the doc by crashing (if it gets big and you have lots of shredded format codes due to cut& paste), you can use LibreOffice to clean it up.
As for creative writing, I like Ulysses. I'm on the beta for both the iOS and OSX version, and as good as it already was, it's getting even better IMHO.