Old news but 1st time buyer. Totaly impressed. Micro switches feel quality, pointer accuracy is superb, realy happy with it. I had 2 x MX 518's that both had the "Hollow Noise" problem. Rest your fingers on the left/right buttons then lift them. You get a hollow thud noise. Got a refund and went for the Razer. Crap pic but I'm "lovin'every minute". 
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