Electrostatic panels are much harder to make than drivers. Most importantly, they are very easy to get wrong. You basically need to have a consistent distance between the two stators, and the larger you make the panel, the harder that is. And you need large panels to get any bass at all. You should read the recent interview with the Martin Logan guy for a very honest appraisal -- from, amongst other perspectives, a business point-of-view -- of the process.
spritzer -- you heard Final? I only ask because you didn't mention them. I've heard really good things about Final, except that, like the Quads, they beam. Of course, I've heard similarly good things said about Innersound.
I'm actually a big fan of Martin Logan, and am seriously considering getting a pair. We'll see, it's not going to happen any time soon.