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Title: Dynaflex is the best, and Powerball is the best of Dynaflex
Review: 1) Dynaflex is the best. It is totally new fun and experience2) "Powerball" is the best of Dynaflex (generates the most pressure and requires the biggest effort)3) The only other model you may want to get - it is the same "Powerball" with spead measurement display. It is optional though...4) After I showed it in our office, couple of people purhcased it same day!!!
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