Review (5/5): Amazing!!
I love these so much! They're kinda sheer on their own, but you can still use them - as you can see in my photos. It was very easy to get the design to show up, you just need to work quickly and go nail-by-nail, as these polishes set really quickly and once they do, they won't budge. Apply a generous coat and then immediately apply the magnet to the nail as close as possible without touching the nail. It only took a few seconds for the design to show up but you might need to hold it longer. I used a black base but you can probably use them to top any color to get many different fun results.
FYI: In order to get the results from the image (the S like cat-eye shape), you will need that long magnetic stick that is metallic gray and has two pieces of the same pole facing each other, labeled "S". I just used some patterned magnets to show how they work.