The Logitech G9 gaming mouse does offer a lot of features, from adjustable weights, a dual mode scroll-wheel and on the fly DPI changes.   The price is certainly a drawback, but TECHGAGE soldiered on  with a full review, so you can find out if it is worth it, or not.
“Looking for the ultimate gaming mouse? Logitech’s latest G9 offers a lot… and then some. Included is a switchable body, color-changing LEDs, 3200 DPI capabilities, MicroGear scroll-wheel, braided cable and much more. The question: Is it worth your $99?”

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