Yes, in Fl with the heavy downpours while at the stop light they slow down and one you drive again, returns to the speed you had them.
The only issue I notice in heavy rain at full wiper speed, the windshield stays blurry like there's the need for one more speed.
Maybe it is how vertical del windshield is, but on heavy downpours at highway speeds it gets difficult to see. (the wipers wipe perfectly, it just a thing of milliseconds between passes that gets burry) has anyone notice this?
I got to compare it with a Lexus GX460 and 4runner and both had a higher wiper speed... anyhow I love and prefer the Grenadier any time