The wobbly feet on the Ducky will get stable after a few hours of use, at least that's what happened with mine. The only CQ problem I can confirm with mine is that the plastic above the detachable cable is a bit loose, otherwise the keyboard is perfect.
Overall, If you need detachable cable, lockable windows keys and other features the Ducky offers, go with Ducky. If you prefer better quality keyboard overall, go with Filco.
Also the Ducky 1087 seems to be discontinued, so if you decide to go for that, you might be in a hurry before they all run out.