Got this keyboard today. Compared to my Cherry Blue Filco (non-NKRO), the RK-9000 doesn't seem as crisp. The Filco produces a nice, sharp pitch when a key is actuated, the sound us MX Blue people love. As for the RK-9000, it almost reminds of a Cherry Brown board when typing fast. For some reason, the high pitch gets muffled, possibly by the key bottoming out. It seems like it is easier to bottom out harder on the RK-9000 over the Filco. I think there is slightly more key travel after the actuation point which might explain why. (When I bottom out on the Filco, which doesn't feel as far off from the actuation point, I still hear that distinct high pitch.) Also, the spacebar is more of a thud on the RK-9000, while a gratifying Rice Krispie crushing click on the Filco. I don't think this board would replace your Filco Blues, given a choice, which is sort of what I was hoping for.