Man, I used to love rain-x. I haven't "needed" it since buying my last two new vehicles. I "needed" it on my Chevy Sprint (hey, it was my first car) because I could NOT get any new wipers to work worth a damn.
It prevents bugs from sticking to your window just like the rain. That's a big plus.
What negative stuff have you heard?
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2001 Silver Ice
SE V6 4X4