Oh man, I've heard those speakers before and you are in for a treat, the X series is a big step up over what you are hearing right now. Not that your speakers are bad in any way, but the X series is truly world class. Best of luck with the shipping questions!
I have some Quad ESL 63s, but after multiple ongoing issues with arcing panels, despite being looked at by a quality tech guy on several occasions (and spending quite a bit to try to get them going properly) I gave up and went back to the B&Ws.
The Quads didn't like the humid days we can get where I live, which was a pity, because my wife and I loved the open, "non-box" sound of the Quads.
My hope, and understanding (from reading what you guys are saying) is that the X3s will give us the open sound of the Quads in the treble and mid, plus a whole lot more in other areas where the Quads have a little less "authority". Plus of course, the X3s are a modern design using the best components/technology available etc.
Just read a thread from a happy owner in the Ukraine, so hopefully Australia won't be a problem.
It's interesting - there is growing interest down this way in O/B speakers, so fingers crossed.