I would prefer the knob be anodized the same color as the case or at least contrasting anodizing colors if possible, no polished brass, aluminum or copper.
The knob looks best with no design or just the notch, it looks too busy otherwise.
Three switches is perfect, six might be overkill.
I just bought a cheap usb knob from Amazon for my desktop so I'd definitely love to replace it with this one instead.