@Alain Williams
"I am certain that you can find some users who need to use MS Office because of certain features (eg some macros). But for the vast majority of people who want to knock up simple letter, reports & the such OoO is plenty good enough."
I agree, that in the case of documents and spreadsheets with macros porting them is definately an issue that needs to be considered.
I just wanted to speak up for OOs Writer software. I am currently in the middle of writing a techinical book. I thought about using Word, but after all these years, Word still does "stuff" with the formatting that I don't understand.
I decided that since this was a new, from-scratch project, I might as well look at OO. I installed it, and also found a good document on the web specifically about writing large documents (thesis, books etc) with OO. I followed the advice given, learned how to set up the document the way it needed to be set (e.g. offset margins on left and right pages), set up all my fonts/typefaces etc and... 242 pages into the book (all 242 pages in the same file! (there's a navigator that lets you jump around your document easily)) I've had no problems whatsoever. In fact, it's been a pleasure.
I've found that generally, OO Writer is 'transparent' - it doesn't seem to place any barriers between me and the work I am concentrating on. I don't have to shift my concentration from being an author and writing, and wrestling with the features of the software. It 'just works'. It's very easy to write and format as you go, and hence your mind is not distracted - the writing can flow naturally. Nice.
The klunky interface is fine by me. It means it looks the same on my Windows PC, or on my Linux netbook! Yay! I can write on the train, or in the house. Bonus. The MS 'fisher-price' interface looks like it was designed for babies and was an instant turn-off for me when I first saw it. Why should I have to learn to use a peice of software all over again?
I'm very happy with OO. $0 is a great price. But even if i'd paid, say, 20, 30, 40, or even 50 pounds for it, I would consider it to be very good value for money!