2011 MacBook Pro - Is 16G RAM Worth It Compared To 8G?

I have an early 2011 MacBook Pro 2 GHz Intel Core i7. Even though Apple states that the maximum RAM is 8 Gig, the general opinion here seems to be that 16 Gig is possible. However, I could not find any comments indicating how much better, if at all, 16G compared to 8G (I currently have 4G). Apple has told me that even if I put in 16G, the system cannot take advantage of it becasue it is only designed for 8G.

My questions: How much better will it run on 16G compared to 8G? Is it worth the extra $100?

Thanks

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