How is the intensity, another user above reported that it is too low to feel. Are you able to feel the haptic vibration on your wrist? Does the watch needs to be connected to the phone to work? have you tested the battery, like how long can the watch last with continuous vibration? currently my gamrin watch lasts approximately 10 hours, which is great. are you able to use some sort of shortcut to quickly turn on and off the vibration haptic on apple watch?