Unless there is more heat exchanger surface area, it won't help with cooler over the OEM unit. I think most of the time when somebody sees an improvement, it's because they were fixing an existing condition that would have been fixed with a new OEM unit as well (such as bent or plugged fins, maybe even goop inside from using the wrong coolant).
All-metal is certainly more durable however, and that on its own is a good reason for one. That said... the vans aren't as hard on them as the pickups... I always tried to encourage F-series PSD owners to go all-metal, because those trucks can apply some twist to the radiator, because the chassis on it's own twists a lot more.
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2000 E450 dually V10 wagon
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