What does air pulse feel like? Rhythmic waves of pressure rather than direct contact. Most people describe it as closer to suction than vibration. It's a different category of sensation, which is why it has such a following.
Can I run both ends at once? Absolutely, and the tool bends to the shape of your body so that you can adjust as needed.
Is it loud? No. The Spellbound is very subtle.
Is it waterproof? Yes, fully.