What is this "fog" or haze you guys talk about? I have used Rain-X for years on many different vehicles and never had a problem myself. I can't imagine ever driving without it in Florida downpours!
If you guys are running the A/C, is it a meat locker in the car? Sounds like possibly your windshield is condensing momentarily due to the temp/humidity difference after the wiper swipes away the moisture? With Rain-X, you can see how much easier morning dew accumulates.
I know my newer BMW will open up heated defrost vents for the windshield and two front windows as part of the climate control program when it senses rain (ties into auto wiper module on electrical bus). Keeps the windows from fogging up due to a much colder interior temperature and the lovely humid exterior environment when using the A/C. Despite this, I still have never noticed fogging windows because of Rain-X in my older cars and ones with more primitive HVAC systems.
This Aquapel does sound interesting, though. I find that Rain-X isn't effective for more than 2 months or so. But I have never had a problem with that nor it's price

! Doesn't hurt to try new things!