Is it worth paying more than $30 for a smart scale?

If you only want weight plus a basic BMI/body fat estimate, the budget Etekcity model at around $23 covers it and is one of the most-reviewed scales on Amazon. Paying up gets you Wi-Fi sync without your phone (Etekcity HR), 8-electrode segmental analysis (Arboleaf), or premium handle-based scanning with dual-frequency BIA (RENPHO MorphoScan Nova). The jump from $70 to $190 is mostly about electrode count and app depth, not weight accuracy.