After my flight yesterday, I think I've come to the conclusion that I would not want to pay for this. 26A had enough legroom for me anyway, and the lack of a window at 21A, as well as noe storage right above the seat, makes it a no-go for me - at least if I have to pay for it.

On the other hand, on my connecting flight from LHR to OSL, the seat shifters had been forced by the curtain movers to put me into the emergency row on the A320, without ever having to confirm those points mentioned in my first post in this thread.