I believe the results speaks for itself. While there can never be a 100% guarantee I am very impressed.
A total of 25 trials were conducted with the treatments (i.e. Sharkbanz and Sharkleash) and control resulting in 2 hr 38 min of soak time exposed to the bull sharks with a total of 1235 approaches and observed behaviors. During the 2 hr 19 min with the treatment, there were zero attacks on the human model. Trials with the control were stopped once the human model was attacked. During the 18 minutes of trials with the control, the human model was attacked approximately every 46 seconds