Steven
Thanks for the update. The SU seldom appears on the used market, there is absolutely nowhere to go in 4x5 from there! My RSW broke when the tripod toppled over, so I needed a camera quickly having to bite more than one bullet. I fully understand that it is a significant purchase. My wife was less than impressed! But then again, she is over this now whilst I continue to be impressed every time I use the camera.
There is a more detailed article about the asymmetrical movements, amongst others on Dead Link Removed but it rather makes a meal describing something that is just so right and works.
I suspect you will consider it worth the wait, another downside is that it is not a light camera.