Bahamian Escape and Caribbean Blue are bit difficult to apply. They go on too thick and you have to wait for each layer to dry a good bit before applying a second coat, or else the first coat will smear. I don't know if this can be fixed by adding a few drops of thinner, but as soon as my Sally's has their thinner back in stock I'll pick some up and try it. Blue Island Iced Tea is very thin and you need 3 to 4 coats but its easy to apply.
Summer Days: I love these colors! Its a great summer collection. Watermelon Rind is a bit sheer and needs 3 coats but its gorgeous and has a little bit of a metallic shimmer in the sun light. Strawberry Fields is a pink with gold shimmer, its a great color but I wish the pink was a bit more vivid. Raspberry Festival is a hot red with pink and red shimmer, you also have to let each layer dry before applying each coat.
You can get these at:
transdesign.com - $2.60