In my photo below, I've used this product underneath my usual foundation.
This primer makes a noticeable difference in how natural and smooth my foundation looks on my skin. I have lots of acne and dry skin, and it totally smooths it out and doesn't worsen my dry skin. It also helps keep the foundation in its place while applying concealer, helping me get some serious coverage.
I love how the ingredient list is so natural. It's mainly plant extracts, nothing more. It'd be cool if someone could break down what each extract is doing for the skin.
I don't like how the primer smells though. Almost reminds me of faded perfume. It's vaguely noticeable throughout the day, and especially noticeable while applying. I also dislike the stickiness of the primer, you almost have to drag it over your face. I also suspect that it was contributing to my acne since my face improves when I discontinue using it. It's too bad, because I enjoyed how it made my foundation look.