I was skeptical about app control at first, but syncing it to my phone through the free app turned out to be the best part — I can tweak the intensity without fumbling for buttons. The vibration range goes from a gentle tease to genuinely intense, which surprised me for something this compact.
The vibrations are genuinely strong, and being able to adjust the intensity from the app instead of fumbling with buttons is a nice touch. Took a minute to pair with my phone, but once connected it worked without a hitch.