PROS: MAC eyeshadoes are absolutely amazing. The pigmentation in every single of these eyeshadows is so awesome, it's rediculous. They blend very easily, and MAC has a huge variety of colors and finishes. MAC eyeshadows are very long wearing, and I always get complements no matter what color I'm wearing. For the natural-day-time-look, I use the colors All That Glitters, Honesty, Tete-A-Tent, and Bamboo. For the night-time-look I use the colors Steamy, Mystery, Electra, and Typographic. (I think I buy too much)
CONS: For singles, they are kind of pricey, quads are the way to go.