The reviewer, Bri, introduces the Fully Charged Mascara by PUR in their video review. They demonstrate the application process, emphasizing the noticeable difference it makes even with just a single layer. Bri advises applying the mascara slowly and leaving it on for a few seconds to achieve optimal results. They also mention that even half a layer can create a significant impact. Overall, the Fully Charged Mascara by PUR seems to be effective in enhancing lash volume and length. However, the review does not mention any potential drawbacks or specific benefits beyond the visible difference it creates.