i like them cuz they go on really nicely and plus they're very versatile.. like if a certain color is too dark, you can mix it with a tiny amount of concealer to lighten. You can also mix with other colors to create new shades. That's the great thing about mineral makeup.
The website doesn't really give a very accurate picture of how the colors actually look (and of course it'll look different on everyone), but I usually read up reviews on www.makeupalley.com to see what others say about a particular eyeshadow before I purchase.