I love Benefit! I first learned about Benefit because of their Benetint lip and cheek stain. I like how it looks but it kind of dries my lips out.
I can't speak for all of their products but I have been very happy with these:
Dandelion face powder - awesome for pale skin to make you look awake (Georgia Peach is great too depending on your coloring and preference)
Dallas blush/bronzer - gives a more natural look on me than regular bronzers
High Beam and Hollywood Glo highlighters
Eyecon eye cream - although if I use too much it makes my eyes water
You Rebel tinted moisturizer
Jiggle Gel - it's temporary but feels really good on tired legs and really feels like it helps!
I've also used their Some Kind-a Gorgeous foundation, which is highly rated in lots of magazines, but I found it some kind-a heavy and greasy on me.
I want to try That Gal brightening face primer, Bad Gal blue mascara and Thrrrob face powder but I am currently on a self-imposed cosmetics restriction until I use up all of the products I have amassed.