I've been using Zaino (Z-2 + ZFX) on my new 325xi including the windows. The body looks fantastic (you guys, especiall DK, were right) as does the windows but the beading effect and water shedding effects on the window is much less than what I had with Rain-X (a silicone product) on my old car. I'm afraid to use a silicone product, not sure how it would affect the Zaino on the rest of the car. What other products do people recommend, especially if you are using Zaino on the rest of the car? Thanks.