I have one of the kits on my M1008. Some people think it's not needed and others think it would be a good idea. My thought it's worth a try and would only be beneficial given the history of these engines with blocks and or heads failing.
I do not have any data as to it being better or worse than the stock system. The truck has been driven across the USA two and a half times without any issues.
The radiator is a aluminum and plastic unit, I have driven it thru some extreme heat conditions towing a M101A2 trailer and so far, no issues.