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I tend to design in such a way that capacitor performance is not critical, but there are a few places where it can't be avoided.
When a capacitor is used as a timing component it needs to have a known value and that value needs to be stable, so I am interested in knowing about stability and accuracy with this technology - over time and temperature.
When a capacitor is used to determine analog filter characteristics, it also needs to have known value and stability. I have been leery of MLCC technology that changes capacitance with voltage - classic filter equations have a problem with that. I am interested in seeing if this technology does better.
I have not yet looked into the kind of Q available with this technology, but losses and ESR become factors in high performance capacitor applications.
Another area I don't yet have a feel for is how footprint size affects voltage and capacitance ratings.
These may have been covered already - they are just things I don't know about polymer caps.