Every company making electrostatics has its own approach, so each design in this category is a mixed bag of attributes -- mostly positive, some negative, and rarely indifferent.
To begin with, and probably why you’re interested in electrostatics, all offer exceptional clarity, immediacy, smoothness, low distortion, and transparency, especially in the midrange and treble. Various criticisms, however, have accumulated over the decades, spread out among a number of makers, past and present.