my wife and I did it when we got married. He is for money what AA is for drunks and what Weight Watchers is for obesity. He super simplifies things for those who have no self control. It's not that it won't work, but its for those who cannot do moderation.
His program did put my wife and I on the same page, and we attacked school debt, a car loan, and the down payment for our house. By the time kids came along we were able to make decisions based on what our family needed, not what was in the bank account. Don't vilify the guy. He's offering a great solution... for those who cannot reliably make good financial decisions.