Customer Rating: 
Summary: Does The Job
Comment: I gave this little bottle a try after hearing some reviews and commercials about it for several years. Application was easy: thoroughly clean the windshield, apply the stuff with a cloth in circular motions, let it dry for a few minutes, and wipe off. Had two rain storms since, and each time the water beaded up nicely on the windshield. Below 35 mph, the droplets will stay in place. The wipers have an easy time though - no streaks even if your blades are a little worn. Visibility is improved by seeing large water droplets instead of a sheet of rain pouring down the windshield. At about 35 and above the water slicks right off to the edges. I still would use the wipers in heavy rain though. I haven't had a chance to try it in cold/snow/fog weather conditions (it's summer), so I don't know how that would affect it. Side note: I applied it on my wife's older car (with more knicks and scratches in the glass), and she didn't notice much improvement. Could be the type/condition of the windshield, or maybe she just expected more out of it.
Either way, for the three bucks it cost at the local store, I'd say it's worth it. The product is good, it does what it claims, and the price reflects the small, but nice benefit it provides.
Customer Rating: 
Summary: Great in some situations, dangerously bad in others
Comment: In heavy rain at highway speeds, Rain-X is amazing. Water blows off the windshield faster than the wipers can remove it. In light rain, or at slower speeds, there is little advantage to Rain-X.
Where Rain-X becomes a serious danger is in misty, foggy conditions or if there is dew on the glass. Under these situations, there appears to be too little water to form large enough beads for the wipers to remove, resulting in a heavy haze that will NOT be removed by your wipers(or quickly reforms). Driving into the low morning sun/oncoming headlights etc. with that type of haze results in inpenatrable glare that makes safe driving impossible. I have experienced this effect in different cars and using various forms of Rain-X (the above liquid and the premixed washer fluid.) Because of this very dangerous side effect, I cannot recommend Rain-X if you live in an area where dew or misty conditions occur.
Customer Rating:
Summary: Fantastic!
Comment: You don't even need windshield wipers with this, and given the fact that the Arizona sun usually ruins them before needed, this is a very good thing!
Customer Rating:
Summary: Love this stuff
Comment: Its a great product it coats when it rains when you just put it on you dont even need to use the wipers but it does take some work to make sure its not smeared looking. Clean your glass good with windex first then apply and polish off. I dont really buy any of those as seen on TV items but this is the first one that really works well also if you side windows squeak this will help with that as well since is a slippery it will help with weather stripping. Remember this works best when over about 40mph... and you will have to keep reapplying a few times a year
Customer Rating:
Summary: Good but not below about 35 MPH
Comment: Rain-X works great if you are driving pretty fast, but if you are not driving very fast the beads of water don't get "blown" off your windshield.
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