There is a window that the ecu doesn't touch timing in most cars. You can go cooler to a point with no problem and some benefit as Vince posted. Under a certain point and your timing and fuel maps are effected and too hot and the same happens.
The aluminum rads are more efficient which will keep the car cooler under demanding conditions where the factory rad would have started to be overwhelmed and couldn't shed heat fast enough.
On a street car they are probably just bling. On a car that sees road courses, drifting, long AutoX courses, etc. they are definately money well spent. In these scenerious the stocker would have not been enough and you would be running overly high coolant temps.
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2000 MR2 Spyder (Yellow)
2013 Hyundai Elantra
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