I used Magnepan center with my Electrostat Hybrids in the past with great results.
center channel
I have an all martin logan speaker system, and want to experiment with a different center speaker. I currently use a Martin Logan Logo, but thinking of taking one of the Martin Logan SL 3 surround speakers and use it as a center speaker, and putting Accoustat or ELF speakers in surround. Use Martin Logan CLSiiz up front