Highly confident due diligence was performed by Board.
A "go shop" provision could always be required by independent directors, but the initial bidder would need to be compensated if it outbid.
Not sure how close Gates is to the transaction. If he was personally involved, Gates most likely would have talked to good friend Buffett. I would expect the result to be a fair price.
"Someone said it takes 30 years to be an instant success" - Gabriel Barbier-Mueller, CEO of Harwood International