What are the advantages and disadvantages of Frito-Lay drivers stocking their customers' shelves?

What are the advantages and disadvantages of Frito-Lay drivers stocking their customers’ shelves? The disadvantages are the cost and time spent having the drivers restock themselves. When they take this role over it is necessary to have enough drivers to ensure everywhere is being stocked on time. The advantages are they know how the company wants their products displayed. They also don't have a lag time of the stores employees restocking the shelves because it goes straight from the truck to the shelf.