Here's a personal experience for everyone:

My step-dad has a 2004 BMW 325i and used some Eagle 1 wax before he tried 5StarShine. At the time, he lived in Aurora, CO and applied the wax on a "warm" winter day in his garage. Yes, the car was garaged daily but it also saw snow, salt and ice daily on the way to work. Due to mass layoff's in IT fields, he relocated to AL to find work. To make a long story short, he had the wax on for about 6 months in harsh conditions and didn't wash it for at least 3 weeks after he arrived and the water still beaded like the wax was fresh. Dirt came off so easy for normal washes, bird crap came off without leaving stains or residue, and tree sap came off without a problem. I'm truly impressed with the product and love it!