May not work exactly as advertised...
Ordered these for my wife. So far she has only tried one of the colors. (Lightning) She used a matte black base coat and after that the polish did cover very nicely. We did not have the magnet tools yet, so we used a small pick up magnet from my tool box. One thing to note, this polish is lacquer based so it dries very quickly. You have to polish one nail and while it's still wet use the magnet. You'll only get about 15 seconds before it starts drying.  We just went diagonally across the nails...you can somewhat see it. We ordered a set of magnet tools, will reserve final judgement until she gets to use them. I'm betting the gel type polish may work better for this effect because it stays wet until cured.  Even without the "cat eye " effect the color is somewhat holographic and the shade changes depending on the kind or angle of light.
Rating: 4 stars