Review (1/5): I Tried.
We were planning to use these for gradient nail art. I've used many other brands before and had great results. I thought this would be a good value. It wasn't. The sponge part fell apart and left bits of sponge in the nail polish. Not good quality.
Update: Since these were no good for nail art, I decided to try them for putting on foundation. Same problem. They seemed to fall apart almost immediately and left bits on my face. Not a good look.