I used to use World of AI for FS9, and I can only say good things about it - it's actually somewhat better than similar payware add-ons in the sense that it's more customizable and a little more detailed. The downside to it, of course, is that it takes a lot of time to download and install all the airlines, and you still end up with gaps. I used to run it on my old PC, but when I had to rebuild my FS9 config, I decided that this was going to be simply too much work and paid for Traffic2005, which I'm also quite happy with.
At least with my FS9, the main reason I turn down traffic is not because it gives me a performance hit, but because past a certain point many airports get impossible to navigate. And I don't even have a very powerful PC.
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There are only forty people in the world and five of them are hamburgers.
-Don Van Vliet (aka Captain Beefheart)
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