Check out this article by Dane Wiren, the famous Dr. Gary Wiren son on what makes a training aid great. Excerpt from the article “Be wary of products with promotional claims that are enticing but vague. If a product has claims like, ‘Lower your score by 3-5 strokes’ or ‘Hit it by your buddies’ without examples of the problem it addresses or what the product really does, it’s probably not worth your money.”
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What Makes a Great Training Aid According to Dane Wiren