I'm happy to see that the JS for the spreadsheet demo (including jquery) is under 1mb... though I still consider 750k to be huge for a JS, for the functionality it isn't bad... Didn't look at the other demos, or interact, was just curious as to the size.
This is not something you would probably want for most public facing sites/applications, one of the larger demos weighed in at 1.7mb of js... again, very impressive for the functionality. I only hope that I can remember about these guys should I ever need this type of functionality again.