Nails Inc. is the best nail polish I have ever used. A friend bought this magnetic polish for me, and although I'm usually not one to have super funky nails, I love the effect and have received so many compliments on it. I have the purple shade (Houses of Parliament), and it's super easy to use. The designs are awesome: subtle enough that I as a 32-year-old woman don't feel foolish wearing them, and cool enough that everywhere I go, friends keep grabbing my hands and saying, "OMG!!! What's up with your nails?! They rock!"
I noticed that the designs on my left hand came out a bit better than on my left hand. I attribute that to the fact that I'm right-handed and probably didn't have as good of a grip on the magnet when I was painting the nails on my right hand. I'll be more careful about that next time.
Overall, I love this polish. It's definitely worth the few extra dollars. I'll be purchasing the gray and teal versions of this as well.