The reviewer highly recommends the Fitbit Aria 2 smart scale for tracking weight and body fat percentage. They praise the product's build quality, sleek design, and easy setup process. The accuracy of the body fat percentage measurement is mentioned, although professional athletes may need a more accurate measurement elsewhere. The Fitbit app is highlighted as a valuable tool for tracking various metrics and participating in challenges and programs. Overall, the reviewer finds the Fitbit Aria 2 to be a worthwhile purchase.