I think flocked heads make a difference in goose spreads, especially smaller spreads. I don't feel like magnum decoys make a difference at all, but that's just me.
"A man may not care for golf and still be human, but the man who does not like to see, hunt, photograph or otherwise outwit birds or animals is hardly normal. He is supercivilized, and I for one do not know how to deal with him." Aldo Leopold