How much would you pay to see better in the rain? I call it worthy, myself.
Laugh all you want but do you know what a body shop told me to do that worked just as great as Rain X and about 90% less cost. Use everyday car was on the windshield. I put it on the entire windows front, back sides. The better the quality the longer it lasts. When it rains or snows the water just beads off the window. On a $2.00 can of wax (purchased on sale) it last several months. And the can of wax last about 5 years.
Ok, go ahead and laugh, but the people that I've told tried it and never laughed at the suggestion again.
What do you think rainX is. its a remarketed wax or sealant. Plain and simple