are these for background music or for dedicated music listening? Those speakers dig low in impedance (about 2 ohms), so you won't be able to drive those with any ordinary receiver or amplifier. Electrostatic speakers have horrible off axis response, this means when you aren't in the "sweet spot" the linearity (which is great on axis with most Martin Logans) will be lost. This may be desirable for background music because high and mid frequencies will be signifantly reduced (so it would be less distracting). It's also notable that the sweetspot on most Electrostats is very narrow, so placement is crucial.
Nothing Polk produces is going to compare to Martin Logan electrostats in anything but price, they're a little easier on the check book.