[dave256]

Your poll and the responses here probably aren't going to give you accurate results since the people reading the forums are probably people who regularly use the software.

I've been using it on the Mac since the original sneaky peak previews and on my iPhone since it was available. I had just started reading about GTD before it came out (and briefly used kGTD with OmniOutliner) before OmniFocus came out. If you're the kind of person who likes the GTD concept (being certain you've captured everything you need to do and can see what needs to be done), I think you'll stick with it.