The Multi-Tasker 4-in-1 Makeup Brush by Alleyoop is highly praised by Taylor in their video review. Taylor considers it their Holy Grail makeup brush due to its versatility. The brush combines four essential brushes in one, including a sponge, an angled eye brush, and an eyeshadow brush. This compact design makes it convenient for travel, as Taylor often carries it in their purse. The reviewer appreciates the ease of use and the ability to have all the necessary brushes in one product. Overall, the Multi-Tasker 4-in-1 Makeup Brush by Alleyoop seems to be a reliable and practical choice for makeup enthusiasts on the go.