I got it for nothing, if I bought it I would take g502. -added- After a month of use, I sold and bought a g502 with a more familiar mx510 shape, I’ll immediately say g403 and g502 are both good. Got pros: design, pmw3366 sensor. before that, the reliability of the logic leaks was never let down by mx510 mx518 Its cons: many write that this is a clone of the razer, but it feels like you are holding it, the plastic itself (very light and rattles), the wheel, well, just like Microsoft Intellimouse Explorer 4.0
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