So I was on the fence about these when I first saw them. These are one of the innovative steps coming along in the nail polish industry. Think of them as more compact nail polish pens. You invert the polish and press the pod until a dot of nail polish is on the built in brush- then paint your nails. The nail polish comes on nice and thick and you get a good wear out of it; but I honestly am still on the fence about these. After two coats I barely had enough for a second use- so I definitely think these are meant for one manicure. I think that it’s a great idea for an on the go option. Just throw one of these in your purse for an on the go mani! But for long term use, invest in a bottle of Formula X. It’s worth it.