This is a very late reply, but I just bought the K63 wireless, and it works perfectly fine with Linux. Also, it has Bluetooth (7ms response time), can work with a 2.4GHz dongle (1ms response time), and can also be used as a wired keyboard (via the Micro USB slot).
Although I haven't owned this keyboard for long, I really enjoy typing on it. I type very quickly, and this thing never misses a keystroke. Compared to my other mechanical keyboard, the K63 wireless is relatively quiet. It doesn't make much noise at all - doesn't have the loud "click" sound found on some mechanical keyboards.
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