Well, I installed it recently, more as a 'bling item.' I was hoping to get a small drop in Water temps as a bonus. To my surprise, it actually made for a regular 2-4 degree celsius drop from regular H20 temps, and about 6 degrees less when the Tstat opens. On top of that, the weather here had been about 10-15 degrees before normal just before I installed it, and are at about normal now. So really, it prolly lowered it 4-6 degrees normal, and 8 degrees Tstat.

I purposefully got the APR because it fully covers the area above the radiator, and is not a 'partial cover.'

As a side note, I don't know that I would suggest this for those that are consistenly in stop-and-go traffic, as it will effectively trap heat if air is not moving.