I bought a Groupon for a $23 admission, which includes a free green-screen photo (really cheesy - I feel bad for the photographer -- what are you doing with your life) and 20% discount from their gift store (avoid -- everything's overpriced).
However, I am a lifelong fan of learning something new, so be it small or big, this exhibit features information about Leonardo da Vinci that the average person wouldn't know about. It went in-depth about The Last Supper, the Mona Lisa and featured many life-sized models of da Vinci's inventions. A lot of his ideas can be seen today in modern times.
The exhibit is definitely worth the Groupon, but I would skip it if you have to pay full price.