I have two Barry M magnetic polishes, from before they brought out the super sparkly ones. I don’t use them very often because they require ninja skills, and serious hand-eye co-ordination to get right. Plus I find that my nail beds are so long and curved, the magnet only reaches down the middle strip and it looks kind of odd. In any event, I decided to give it another try and quite liked it!
Advice: Use a light top coat, as heavier ones can drag the magnetic particles. Ninja skills, get them. I do one coat without the magnet and then use the magnet on the second when the first coat is very dry.