That looks slightly different. It may well be the same under the skin but perhaps it's OEM or something.
The fact it's described as a Powerball means it probably is genuine but IIWY I'd get one from eBay: http://search.ebay.com/search/search.dll?cgiurl=http%3A%2F%2Fcgi.ebay.com%2Fws%2F&fkr=1&from=R8&satitle=powerball&category0=
Also the eBay route you have the full range of models. The Amazon one doesn't include the rev counter. Unless they do one that does.
eBay is cheaper too.
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