Got to say, I am very impressed by this product. Never used it before but heard a few guys talk about it and so took the plunge.
As a 'rain repellant' it is very very effective, I did half the front windscreen with RainX (driver's side) and the other half I left as is. It was very very easy to apply, make sure the screen is clear and then just wipe it on and buff it off, job done in 2/3 mins.
Fortunately it rained today and the stuff worked a beauty. On the RAINX side, you could see the rain just beading up the windscreen as you drive along and you hardly have to use the wipers to see what is ahead of you. The water justs beads off, little splatters occur when the rain hits the screen but otherwise it all just beads off. The unRAINX side was awash with water and I was amazed [img]/ubbthreads/images/graemlins/shocked.gif[/img] at the rate the water was being collected on the screen.
Admittedly you do have wipers that do the job, but for a £5.00 for a bottle of RAINX (which I am sure will last for a quite a while), you do have the added benefit of a much clearer windscreen when it rains and also the bugs don't see to get attached to the windscreen, [img]/ubbthreads/images/graemlins/groovy.gif[/img].
Bargain I say.
Anyway, just thought I'd mention it.