Don't know if this is something decent:
digital
NMB rubber dome. Those enjoy a pretty good reputation, though the yellowing isn't too pretty.
Maybe it is, or someone pays to find out it is not;-)
Same with this:
Siemens
That's a mushy as hell rubber-dome. Avoid at all costs.
I wouldn't call Siemens/FSC boards "mushy". They are soft, medium-force rubber domes, but with little key wobble and friction in spite of a 1-piece key construction (the latter two factors make all the difference between a "soft" and a "mushy" rubber dome). Like poor man's Topre. Only the lettering is notoriously weak, which is why I don't use my KBPC PX.