The machines In the exhibit are amazingly well done and great to see made instead of just Leonardo's drawings..
However, the exhibit has problems. In an attempt to make it "elegant", the lighting has been dimmed, and the wording on the individual exhibits was made small; too small for a dimly lit area and older guests. So, if you go, make sure you wear your glasses -- bifocals if you have them.
The staff said it was being corrected, but the video projector showing the short documentary about Leonardo's 'The Last Supper' had a vertical shake to it. Also, at least half the people were sitting on the floor to watch it. A few benches would have been a welcome addition.
I also had difficulty finding the exhibit. Not one of the three employees I asked knew where it was. It is right by the hotel registration desks, so follow those signs.
All in al, not a bad exhibit, but not worth the $27 it cost to get in.