Good to know. By chance, are you closer to the equator or in a high sun environment? How about trees, sap, sticky residues? Even here in New England, when I use a reflective sun shield on my Miata, I find it actually cooks the blades while it protects the dash. All of that sunlight and heat is reflected back against the bottom of the blades. When using my cab cover or full car cover however, the blades and the entire interior are protected from UV rays and heat. The blades last much longer. This is something to keep in mind, and who knows how old those blades were on your car or what they were exposed to on the trip over. In the middle east, people put little socks on their wiper blades to protect them until the rainy season comes, if at all. Speed also can help push the blades against the glass and keep them stable while they might be dry and stiff and chatter otherwise. Or they can lift and chatter because they are too light under the springs. I've stopped using Rainex because it didn't help with the blades aging and damage. I don't like the foggy beading effect at low speeds either. That is actually an issue on the Miata rear window and a small squeegee is better to give a once over when you get in the car under rainy misty conditions. Rainex didn't help on the rear because of the aerodynamics and low pressure.