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Full user review
"Open Source, OpenDocument, and Free"
At my workplace I use MS Office 2003. At home, though, I switched to OpenOffice almost two years ago, and prefer it to its MS counterpart.
OpenOffice lets me save files in OpenDocument and PDF, and I can open, edit, and share files with MS Office users too. I've shared PowerPoint files, fairly complex Excel spreadsheets, legal documents, and even a book manuscript in Word format with change-tracking, and haven't had any problems.
I use word processing the most, and I've come to prefer Writer to MS Word in some ways (and I always liked Word). There are advantages to the way it handles styles, templates, and sections that make assembling long multipart documents easier.
My PC isn't the latest or greatest, but OOo runs fast on it, and has been stable and crash-free.
I used MS Office for a long time, but now when anyone asks, I recommend they try OpenOffice first.
None, if you're an intermediate or advanced user. PC novices will find the learning curve a little steeper than MS Office.