[zapp]

The 90° move on the screen is fine for waistlevel finder like shooting - which I used on my F4 and Rolleis before - extensively.
Holding the camera upside down and above your head also calls for this finder, but in combination with the articulating arms.
So far I can easily get the rear screen in a usfeul position and back quickly - whenever I want. I am about to be convnced of the concept.