A few English, American, and Japanese companies make this class of speaker, which I have to admit are old-time favorites of mine. The first Quad electrostatic is the most famous example of a speaker decades ahead of its time. There is a downside, of course, and that is very low efficiency, an extremely reactive amplifier load, restricted dynamic range, fragility, limited bass, and a tricky room-sensitive dipolar radiation pattern that becomes quite directive at high frequencies. These problems are not easy to solve, particularly the large-panel dispersion, which is not an asset, but a serious problem for stereo imaging. The new Quad uses a complex phased array system which approximates a spherical radiator.
Problems still remain, though.
A few are made in the USA, being represented by Apogee, Magnepan, Eminent Technology, and others. The arrays of magnets provide a somewhat uneven drive field, so the uniformity of diaphragm motion is not in the same class as an electrostat. Then again, HV arcing is not problem, so the magnetic-planars can play a lot louder than their electrostatic cousins. The magnetic-planars have weak magnetic coupling, which is much lower than a dynamic driver due to the large magnet spacing and shorter length of wire in the gap. By contrast, in a planar-magnetic, damping is mostly provided by the stretched film and the air load, and little by the amplifier.