While the fresh patties will cook faster than frozen ones, the transition will be a costly one for McDonald’s, requiring changes in storage and shipping. CNBC says “McDonald’s suppliers spent upwards of $60 million updating their supply chain to transition from frozen Quarter Pounder patties to fresh ones”—clearly, a gamble that McDonald’s thinks will pay off. But tinkering with such a tried-and-true, decades-long classic like the Quarter Pounder certainly will not be without its risks—not unlike messing with the beloved Coke formula, and look how that turned out.

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Still, CNBC notes that “After the test of fresh beef in more than 400 restaurants in Texas and Oklahoma, the company said it received a 90 percent satisfaction rating from customers as well as a 90 percent intent to repurchase rate.” No word yet on the transitional fresh/frozen status of McDonald’s non-quarter-pound patties—for Big Macs and traditional cheeseburgers.