Quad vs. Martin Logan?

How does Quad and Martin Logan compare? How about other Electrostat manufactures Innersound, Magnepan etc?

I have heard great things about Quad and the company seems to have a great tradition. Did Quad create Electrostat technology? I have no dealer close to me (far, far away) and I would like to have some feedback so that I might plan an audition when traveling soon.

Thanks for sharing your time!