I'm not thrilled with the way Double Decker looks - it's a bit messier than the ads lead you to believe, but it has multiplied well for me. I wonder if my partly shady situation is why White Swan has also done well for me - same area as the Do Deck.
I also have 'Midnight' (a short variety) and the yellow E. paradoxa, both of which have done fine in that part-shade area.