I like rain X also, but as fas as windshield wipers go I think the cheapies are the better choice. Last year I bought a set of Bosch teflon blades from CDN tire they worked good for about two months, and then they started streaking, and they cost $17 each. This year I bought the cheap $4.99 version, and they're still going strong after a month and a half.
A good trick to try is to clean your present blades with rubbing alcohol, this actually works, and extends the life of your blades for an extra few months.
So if I change my wipers twice a year with the cheapies It'll still cost me less than the teflon type blades. I could swap them out three times for the same price of the expensive ones.