It helped a bit with the sound and feel but really should have been included with the keyboard.
I just got another Sense 75 and not sure if I would buy this again for the new one
This single panel of thin foam must be installed between the case foam and the PCB. The stabalizers must be temporarily removed. The result is a slightly softer feel to keystrokes, more noticeable with the Sense75's stock (aluminum) plate than with softer plates installed.
The sonic improvements are less noticeable. If you want to decrease ping noise, I suggest upgrading the case foam... available from other vendors.
I truly believe that these should have been included with the original Sense75 keyboard - they're a nice addition but I had to buy it on top of the keyboard. It comes in good packaging and it's easy to install. These change the feel of the keyboard, but not the sound as much as I originally thought.