I've got to disagree with the above posts.
I bought ESL-63's and sold them a month later after hearing the Obelisks.
When I first saw them, I was totally unimpressed by their size. But the sound surprised me. I found them to have a transparency that I thought only electrostatics possessed. Yet, the Obelisks did things that I heard no pure electrostatic do.
They are dynamic, project a vivid soundstage, and, if you like, are holographic. To truly appreciate them, you need to be able to turn off the visual cues and see with your ears. The Absolute Sound recently described these speakers in glowing terms. (Email me and I'll look for the article).
This is less so with the Shahinian Diapasons, which are large and make a much more dramatic statement. I frequently get lost in the music they recreate.
Anyway, here are other Audiogon threads that discuss Shahinian speakers...
http://audiogo1.iserver.net/cgi-bin/forum5.pl?cspkr&977643877&read
http://audiogo1.iserver.net/cgi-bin/forum5.pl?cspkr&955224099&read