rydawg & Fallguy,
The 185 contains abrasives. You can observe it when you leave the bottle undisturbed for a few days. The color will sink a bit, and the powder will settle on the bottom. So, it is a mechanically acting cleaner glaze, which removes impurities, water spots, to a certain degree and fills a bit as well.
The 1000P is a strong foundation. LSP doesn't mean strictly last. When you apply a spray sealant or QD over your existing LSP, it won't be the last step technically and from the film build point of view. 185/217 would take away from the 1000P's protective abilities, that's why I say that this product is VM on protective-steroids. Cleans as good, fills as good but protects more.
The difference between the 215 and the 185/217 is that the 215 has more bite and protection but it doesn't fill.
I bought my first FK1 products almost a year ago, but I can say that this "thick gloss" aka "another clearcoat" is typical to the FK1 products and they maintain this enhanced appearance for a very long time - well beyond the point where the slickness starts to diminish. It means that the film forming active ingredients doing a very good job, providing an even, durable film on the molecular level.