it depends - they kind of implied that it takes a largish change in electric field before the dipoles change state - it may be that they only work for large vol

it depends - they kind of implied that it takes a largish change in electric field before the dipoles change state - it may be that they only work for large voltage swings (rather than for smoothing out power supply ripple), and also it may be that they don't have that smooth linear (well exponential really) charge discharge curve that we normally expect from a cap. It doesn't mean that they're not useful, just a different thing rather than a drop in replacement