Where do I start. First of all it's great value for money because you get double the regular amount for a primer. It's not cheap but given the amount you get it's worth every penny. Secondly it really works. I have oily skin and this really helps prevent oxidation which I tend to have a problem with. It also last for ages. I used it every day and it last 5-6 months. In summry, really good product that I would highly recommend!