Macbook Pro with 16Gb RAM??

Do any of you have this? I think it officially NOT supported but apparently works well.

I have the MBP 13" 2012 2.5Ghz i5.

would I see much of an improvement over 8Gb vs 16Gb? I am usually running several programs at once: iTunes, Safari(5 tabs), Mail, NotationalVelocity, Photoshop/Illustrator.

My "Swap Used" is at 4,3Gb at the moment.

(- At the moment I have 4Gb of RAM.)