first , everyone should know that this product be no gimmick , it work . follow with the instructional six minute video , you be guarantee to see result . anyone who do the video properly at the design interval will not question the merit of claim for this product . it be nearly impossible to cheat yourself because muscle be work the entire time to stabilize the equipment . be warn the video remind you of the amusing sexual nature depict in numerous show by now . the personal training and motivation from the instructor provide a few laugh . he constantly remind you to `` keep it away from you face '' , `` go harder '' , `` shake it as hard as you can '' , `` you come for a workout right '' , and `` yeah , keep that core nice and tight '' all say in a strong european accent . the advantage of this device be affordability , durability , and effectiveness . the exercise be destine to provide great result for tone and increase muscle endurance . the drawback of this device have to be in the monotony and repetition . this device can lose its stay power and have limit long term value . it be destine to become a attic filler . for the new user it will definitely be beneficial , but there be nothing addictive about the same exercise for six minute a day with a 5lb slinky\/dumbbell combination . simply state , it be worth the price , but be prepare to find room for it in you next yard sale . for those in need of tone and lose arm fat its a great buy , but the muscle definition be not go to come as a result of session with the Shake Weight pro .