Everyone and their mama has MAC Creme Cup, and they all say that it's a 'your lips but better' light pink. They're right. It's totally pretty and the perfect everyday lip color. Is it worth $15 though? Not at all. Wet n Wild 901b Think Pink is ever so slightly more yellow toned and obviously is a matte. If that doesn't bother you though I think you'd be much happier with WnW's $1.99 price versus MAC's $15.
Single swatch is MAC Creme Cup by itself.
Swatches bottom to top are: WnW 902c Bare It All, WnW 901b Think Pink, MAC Creme Cup, WnW 372s Within These Adobe Walls and Covergirl Natureluxe 205 Tulip.