DA wrote:

But how can you tell because as you say: "Even if it is illusory, we still experience it as real."

- subjective experience is not the required proof; what is required is objective proof, just as you would require objective proof for the existence of God. That's as far as the similarity goes, though. Whereas 'God' is a metaphysical concept/being (depending on your view), free will is a different kind of case. As I see it, it's purely a question of physics, and case for or against can, in principal, be argued on the basis observations of the physical universe. Presently, of course, the case cannot be proven either way, but I think it's only a mattter of time - a long time maybe, but as I said, in principal, not impossible.
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The point about chaotic systems is that, although they are unpredictable, they are still causal. So Chaos Theory has nothing new to say about free will. It turns out to be irrelevant. So, the controversy over Chaos Theory is equally irrelevant.

I knew you was going to say that too ;-)

"Time is what prevents everything from happening at once" - John Wheeler