Reminds me of a cursed HP keyboard I had at work once. You plug it into USB, then your irq rate goes way, way up. All keyboard events telling you the key pressed last millisecond is still pressed. You literally gained 5 to 10% speed when compiling without it. Apart from that, and the way its sleep-state-destroying irqs ate battery, it was a nice keyboard, so some data entry person got it in the end.