The Moroccan oil ceramic round brush, specifically the 45 millimeter size, is a game-changer according to Devin's video review. This brush not only helps to dry hair faster due to its ceramic material, but it also adds volume effortlessly. Devin was able to achieve salon-worthy results in just five minutes, without the need for any additional products. The brush's built-in hair separator allows for easy parting, making it even more convenient to use. Overall, Devin loves this product and highly recommends it for anyone looking to achieve quick and voluminous hair.