Are reviews for Shake Weight generally positive?

Online reviews of the Shake Weight are generally mixed as of 2015. Many customers on Amazon.com state that the weight provides a noticeable arm workout, however, reviewers on WebMD.com and WorldOfDiets.com state that the product is gimmicky and likely not worth the cost.

The Shake Weight is a home exercise device in the form of a light dumbbell with weights that spring back and forth when shaken. The weight comes with a six-minute exercise DVD. The original Shake Weight was aimed primarily at women though more recently a men's Shake Weight has been introduced. Users on Amazon.com give the Shake Weight for women three and a half out of five stars, noting that the product improves arm strength and tone over time.

The Shake Weight review on WebMD notes that a six-minute workout is not enough time to adequately work muscles or burn fat. This review implies that the user is better off performing a traditional resistance workout with regular weights.