Stamina curves and zones help estimate sustainable pace and understand endurance trends. Some athletes welcome the added context, while others see another set of zones they are unlikely to use.
Pros: battery life, mapping and navigation
Cons: value for money, LTE connectivity
Stamina curves help some runners understand sustainable pace and training progress. Trust in live race guidance is mixed, especially when the number conflicts with how hard an effort feels.
Pros: mapping and navigation, battery life
Cons: value for money, software smoothness