Well, that's part of the problem. It takes forever to get it on correctly and goes bad real fast. With all the time involved in using the product, I could have gotten in the Jeep and driven to my desitnation. With the money I can buy a nice fresh set of wiper blades.
About the only situation that I can see Rain-X being useful is when you have a problem with the wiper motor. Otherwise, it is rather counter productive, like the Cone of Silence on Get Smart.
Regards,
DAve