Does anyone know what the big difference is between 11 and 10?

My DH saw PI 10 today for $65.99 and said he almost bought it for me but then he said he thought he remembered me saying they are up to 11. But, if 11 is $49.99 to upgrade and download, I wonder if it would be worth it for us to just buy the box/cd version of 10 for $65. (I have dial up and I am SURE downloading 11 would probably take forever!!!)

guess I should go check and see how much PI 11 in the box is selling for.

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