I have two nail polishes from American Apparel, and was surprised to find that they surpassed my expectations. This is the first time that I've worn Office longer than a day, for I purchased it in the middle of winter and it wasn't quite suitable for the season.
I think it's the closest Tiffany Blue nail polish that I've ever come across. It's the happy median between blue and green. I would advise two coats because the first one can be a bit streaky, but a second coat your makes your nails very glossy and smooth. I do find that it chips a little after a couple of days, but in my book colour dominates longevity.
What's on your nails?