I have the Fog Clear and the Rain Repellant Gel. I just put the Fog Clear on half my windshield yesterday (the interior of the windshield obviously). Once we have a morning that fogs up the windows, I will post a thread letting people know how it went on the protected versus the unprotected halves of the windshield.
I haven't used the Repellant Gel yet. Just before getting the Gel, I put Rain X on my windshields. In a few weeks I will strip that off when I do full detail of my car and give the Repellant Gel a try. I will probably put the Repellant Gel on one fourth of my wind shield, RainX on a fourth, CarLack 86 Glass Sealing Kit on a Fourth and a sealant on a fourth and compare all four against each other. I will post a thread giving the results but that will take several weeks because I also want to test the durability of the products.