I basically use this product instead of a primer, itr's that good under makeup. I find my foundation stays much better, and covers better.
The low fragrance is super inportant to me. I'm sensitive to perfumes, and also just find it just incredibly frustrating when every makeup brand uses a different, strong scent, and you leave the house in a muddy hodge podge of smells. Also it doesn't taste like death if you happen to eat something after applying it ( i know- wash hands!- but it happens sometimes and boy is it off putting as far as "Why the heck would i put something on my skin that tastes like a concentrated pesticide??" kinda feeling). It also doesn't blind you with pain if it gets in your eyes (again avoiding the "Oh my *God* this must be toxic" vibe, and also preserving one's carefully applied eyes! ;))
People have said it's thick, but it absorbs, rather than sitting on the surface, and sort of "sets". It's hard to describe, but skin feels firmer and makeup ready, with no greasiness.
Product also goes a long way- I use it on face, neck, decolletage, hands and forearms, and I get about 6 weeks out of it.