I currently use Office 2003 Professional that I got quite cheaply. Before that, I used Office 2000 for several years on both Windows and Linux. I wasn't particularly happy with either Open Office, Abiword, or KOffice. At the same time, I must admit that Open Office was a major improvement over the last free versions of StarOffice . I absolutely hated the UI for that, and used it only to open up MS Word Documents, or convert Documents over to that format.
When I had a Mac, I made a point of getting Word98 for it, due to the fact that MSWord was the default 'must have' office application.
Before that however , I used to use Lotus SmartSuite, which I really liked, in conjunction with StarOffice for accessing and creating MSWord Documents.
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When There's No There to get to, I'm so There!