The reviewer, Tayler, shares her experience with the Root Touchup Powder in Light blonde color by Style Edit - void. She emphasizes that this product has been a lifesaver for her in between salon visits. Tayler mentions that she chose the lightest color available and demonstrates the difference it makes on her roots. She explains that the application is simple - just push the sponge into the roots and blend. Tayler is impressed with how easy it is to blend and rates the product as stellar, giving it a 12 out of 10. Overall, she highly recommends the Root Touchup Powder for its effectiveness in covering up roots and its ease of use.