PIAA wipers after some use will leave behind some silicon or something on the windscreen that's better than RainX. Don't use both. Pointless.
My unbranded silicone wipers does the same, probably the effect won't last as long as the PIAA ones, but good enough. Anyway, the wipers are still in use after 4 years....


you'll do what I did. Alcohol wipe off the PIAA branding and modify the clip so it's not easily removable. Both my cars are on PIAA and the Myvi has been using it for close to 3 years now still going strong. And the windscreen is coated with some sort of repellant or something from the wiper. It works great to disperse water. 
