This controller has a zero start function built in. The delay in the throttle response is flat out dangerous. I've hooked up other controllers no problem, this one is a nope.
It sure throws a lot of light! Very nice add-on for iphones. Solid build quality. Otherwise a handy and useful unit.
Comes with a nice little drawstring bag to stuff flash and diffuser in. Really improves lighting by being able to move flash off camera for depth. I recommend it to anyone that wants to make their nighttime pictures better.
It limits your ability to maneuver the light and properly utilize it.