I have sensitive skin and acne, and while I want a good foundation, I don't want anything that looks caked on or completely ridiculous. This masks a lot of the redness and the blotchyness of my acne and the areas around it, without making it look too unnatural or caked over. Also, you can really choose how much you want to apply-- as long as you get the correct color, because it is somewhat of a cream, you can just rub it into your skin.
I have issues with purely liquids or creams, because they tend to make me break out. On the other hand, powder just sits on top of my skin and doesn't look natural at all. This is kind of the in-between. It doesn't make me break out, and it looks more natural on my skin. It's light and fluffy and doesn't feel like you really have makeup on at all until you touch it-- then you can feel it, a little bit.
Honestly, sometimes when I look in the mirror when I'm taking this off, I am amazed at how blotchy my skin is, because of how much was covered. It's kinda cool. I also got lucky and seemed to pick the right color for my skin the first time around.
If you're into this or looking for something similiar, Maybelline also makes something in this line called "Airfoam" which is, well, foam that you apply to your face, that is also very light in weight and texture, and you can apply as much or as little as you want. Another amazing product, it's hard to pick between the two. Both are really great.