The Vanish Airbrush Concealer in Oat color by Hourglass is highly recommended by Brittany in their video review. They describe it as the best concealer money can buy, with a super pigmented formula that requires only a small amount for coverage. Brittany praises its ability to effectively conceal severe under eye bags with just a tiny drop of product. They express surprise at finding it on the Flip app for 30% off, emphasizing the significant price difference. Overall, Brittany considers this concealer one of their favorites and highly recommends it for its impressive coverage and long-lasting formula. No potential drawbacks are mentioned in the review.