Let me tell you about my version of the "ick" factor with OO. First, let me preface this by stating I am not a Microsoft drone. I make my living with non-MS systems and use both Windows and Linux at home. When I had to rebuild my computer and couldn't find the CDs for Office 2000, I gave OO another chance (was a user since the German StarOffice days).
It works well enough for most things, and is stable, though a bit slow. However, I found that if I created a document and later tried to view it in Word, the formatting was frequently off. Sometimes by a very minor amount, other times significantly. I found I could not blindly author a document in OO, send it to someone using Word, and expect it to be right or even readable.
Yes, I'm aware this can happen between versions of Word. However, it's expected within versions of Word, but when the same problem crops up between OO and Word, the perception is that you lack professionalism or ability. Not fair, but that's what happens. I'm not enough of a zealot to feel comfortable risking my professional reputation to push open source software. I think I do enough of that with the multiple Linux servers and Linux-based appliances under my control.
If/when OO is able to keep up with MS in the format race, I'll give them another shot, but as long as I have proof each OO document in Word before sending it out, I'll just stick to Word.
Chris