EZ Snap window shades?

I bought some and just cut and installed them. It seems like a quality product thus far. I appreciate your feedback, it was quite helpful. We have a short trip next week, should be in the sun. I'll take some temp measurements and see how effective they truly are. Some of my windows (kids bunk room and my side of the bedroom) have reflectix still. The rest of the windows (main living area and wifes side of the bedroom) will have these. I'm hopeful that they significantly reduce the heat. We have the 15K AC because we camp at a lot of 30 amp only campgrounds, and its a large space to cool down on hot mid-atlantic summer days!