Title: Total waste of money!
Product review: Do not buy this item if your vertical is over 28" or you are an experienced athlete. The books methods don't train fast muscle fibers that are needed in jumping, on the contrary, the only thing it trains is your lactic acid endurance. I gained nothing, instead after 5 weeks of that crazy overtraining I had an injury on both of my knees (jumper's knee). The best method to improve your vertical leap is through weight training (low repetitions and heavy weights) and plyometrics (The Science of Jumping, Jumping into plyometrics, etc.). The AirAlert2 could only work for individuals with poor jumping ability (< 20"), but for them too this is a bad choise because of the high risk of knee injury. The best vertical program I know of is The Science of Jumping combined with weight training.
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