Here's my take on it. I think free-will is an illusion because it doesn't contain any affect on our actions. The prime controller of our actions/thoughts is obviously the brain. We've all seen or read the way damage to the brain can impact our actions/thoughts. This proves that the brain has some if not all control of our thoughts/actions. Did we choose our brain? No. If you'd said you did, I'd ask you to ponder a little further and tell me from what circumstances you choose your brain...this goes up to eternity...At the end of the day, we're thinking from circumstances we didn't choose. You can also analyze how children behave and ask yourself the same question of "why?". Why do children behave in a very specific manner? This would raise more questions. Anyways, I would love to hear what you guys got to say about this philosophical question.