Actually I was just watching something about this on the discovery chanell the otherday..."designing the ultimate bulletproof car." A bomb would rip up these self-install kits. A couple shots around the edges of the window by a .22 caliber would penetrate the window. In order to avoid the vulnerability along the edges, you have to get metal braces along the side. PLUS, if you're inside when someone shoots at the windows, you're going to look like swiss cheese anyway from the glass shards that hit your juggular. It's not a bullet, but it stings too.