The Cos Bar has a nice range of products. I like the location--I can run in and get a product without a trip to the mall. However, before I want to shell out big bucks for a serum, I want a sample to try. I have sensitive skin.
The Cos Bar on Maui is fantastic because they will recommend products and give you tons of samples. The Cos Bar at Kierland does not. When I have asked for samples of products, I have ALWAYS been met with absolute resistance. So I purchase the tried and true products from Cos Bar, and try out samples and buy from other stores (Nordstrom, Neimans).