I used a few of these on my daughter's nails and one on mine. The rest of mine I painted with regular polish. My 4-year-old's fell off within a few days. Mine was intact for at least a week while the regular polish was chipped almost half way off the rest of my nails. It was awesome!
However, when I went to use the rest on all of my nails again, it didn't stick. I'm guessing you might have to use them as soon as you open them. So I had to throw them out.
Also, when I went online to get some more, I realized how expensive they are. So 4 stars for the fact that the one that worked, worked great! Minus 1 for everything else.