No doubt about it, the water repellents will repel water and practically no one would argue the fact that they are marvelous as long as the wipers aren't being used and/or your speed is above 45MPH or so.
So here's my two cents and it's just my opinion; I could be wrong, so feel free to chime in with your experiences, too: The problems I encountered are all the times I'm going *slower* than 45MPH, such as typical city driving in the rain and obviously needing the wipers at these lower speeds. :banghead: Try compounding that with night driving and the stuff seems to be a true hazard, especially when the wipers counter the repellent effects so that the rain water droplets break into tiny beads that can seriously obscure anyone's vision. :angryfire: I've heard the same from others, too... Outside of that, yep it's wonderful stuff for wiperless windshields, boats, airplanes, jets and other craft that rarely spend any 'quality' time in traffic or stay at low speeds for long periods.
So here's my two cents and it's just my opinion; I could be wrong, so feel free to chime in with your experiences, too: The problems I encountered are all the times I'm going *slower* than 45MPH, such as typical city driving in the rain and obviously needing the wipers at these lower speeds. :banghead: Try compounding that with night driving and the stuff seems to be a true hazard, especially when the wipers counter the repellent effects so that the rain water droplets break into tiny beads that can seriously obscure anyone's vision. :angryfire: I've heard the same from others, too... Outside of that, yep it's wonderful stuff for wiperless windshields, boats, airplanes, jets and other craft that rarely spend any 'quality' time in traffic or stay at low speeds for long periods.