Eek! Further thoughts. I think there's quite a high chance the Dynaflex is a copy.
This one is labelled "DynaFlex" rather than "Powerball":
http://cgi.ebay.com/DYNAFLEX-POWERBALL-AMBER-Gyro-New-Dyna-Flex-Exerciser_W0QQitemZ7207908673QQcategoryZ28067QQrdZ1QQcmdZViewItem
And the ad mentions 9,000 RPM as opposed to the Powerball's 12,000.
And the Amazon one is labelled PowerBall, whereas the Powerball ones have a small "b".
I'd avoid the Dynaflex, personally.
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