The STH2 binding will be far more responsive, precise, and direct. You would notice this when tipping the ski on edge and moving from turn to turn. The kid's binding is delayed and sluggish. The STH2 also has much more elasticity and is able to absorb hits/shocks better, whereas the kid's binding will most likely release you from the binding when you don't want to release from the binding. In other words, the kid's binding lacks good suspension and will not be able to discern the natural bumpiness of skiing from "I need to pop out of my binding now".How and what would feel different?