The sample is great for spot treatment. The texture is nicer than a bunch of others I have tried. Totally unscented. Actually works.
Pretty unnecessary- you can get about the same results by letting moisturizer set for 5 min before doing your makeup. This little product is pretty pricey (but it is way nicer than the YBF one I have tried).
It's about whether you feel you NEED a face primer. If you do, this is great. If you don't, save your money and spend it on a better moisturizer.