If you are thinking of getting the sample cans of paints used for determining color, I would like to share the advise I received from our Sherwin-Williams store. They said the base for the sample paints is recycled (old paint, refused colors and returns). The color is removed and the remains used as a base for the samples. The paint is not durable.
Were they telling me this so I would buy a lot of much more expensive paint? Didn't take the chance, purchased the better paint.