I just completed a trip to south of Germany, and, unfortunately, had much rain on the trip... I applied RainX and there is defenitely a positive effect. Indeed the effect of the moving dropllets on the screen can be mesmerizing. However, above say 100 kmph the vision is very acceptable and I drove through the rain with only occasionally applying the whipers.
I confirm the observation that on the RainX treated screen the collected insects clear off very easily by the whipers.
My conlusion after my trip, RainX does improve the situation for my Morgan and i wiil keep using it.
Cheers,
Bert