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In my experience "stuffed crust" is a gimmick used by pizza restaurants with bad pizza.
None of the pizza restaurants (near me) that have good pizza, have "stuffed crust" pizza. And they are always busy, so I don't think their businesses are going to fail anytime soon.
EDIT: As far as I know, only PizzaHut and Dominoes have "stuffed crust" pizza. And I wouldn't order anything from them.
DiGiorno has it (store bought) ... and they're okay. Still not as good as a good pizza restaurant, though.