Just to say Phase delivered my IQ3-100 on Thursday. I picked it up yesterday.
Amazed at the speed of announcement (Sunday) to customer delivery (Thursday)
I upgraded because FF CMOS is something I have been waiting for, with its usable 100-800 ISO, and live view/ focus preview. The extra 25% of pixels is useful, but not the main factor.
Will begin working with the back more fully in the coming weeks.