The Start The Day Beautifully Kit - 6ct by EcoTools is highly recommended by Millie in her video review. She praises the sustainable bamboo material of the brushes and emphasizes that despite being a set of only five brushes, it provides everything needed for a full face makeup application, including shadow, blending, and eyeliner. Millie appreciates the value of the kit and loves the brushes overall. The product's key benefits are its eco-friendly nature, versatility, and affordability. However, the review does not mention any potential drawbacks or limitations of the product. Overall, the Start The Day Beautifully Kit by EcoTools seems to be a great choice for those looking for sustainable and effective makeup brushes.