I have been using ... a bunch of years on my synth as a expression pedals (sustain).
I had some time ago for the sake of switch, as if inverted silent ... whereas the polarity rglant nothing worked. Has since calmed down ...
Ratio Q / P mdiocre enough indeed: can not remember the exact purchase price but I know c'tait much for the era.
With the exprience, I would look srement cheaper ... But overall my FS-5U done his job properly ... Fortunately!