It's still raining here, so my plan to start wandering round photographing some local buildings is on hold :-)
That front element really does feel exposed in the way it sticks out...
Since putting those first few images on the web page I've had a more detailed look at the images I took, and it confirms that this lens is very usable at full shift, particularly when stopped down to ~f/8-11
At full vertical shift with the camera (1Ds3) horizontal, there was no overlap of frames.
I've never been into measuring lens performance quantitatively, but I do await with interest, the findings of some of my 'lens anorak' friends ;-)
In the UK, I believe a few dealers received a small number of lenses last week. At the moment, only the 17mm. No good estimates on the 24 yet, although I suspect Canon expect more of a 'rush' for the 17mm (as far as you do get a rush for a lens at that price...)