Apollo Vibes should always feel good. Vibes should be "played" at an intensity that is noticeable, but NEVER distracting. Therefore, playing Vibes at 100% intensity does NOT increase the benefits.
The lower the intensity you need to feel the vibrations, the better the effect and the longer the battery will last. Apollo Vibes are designed to fade into the background over time, but be noticeable when you decide to pay attention to them.
If you're on a plane, in a noisy stadium, or other loud environment, you may find yourself needing to turn up the intensity for the vibrations to be noticeable.