Flutes are very limited in what you can get out of them. It is near impossilbe to get a double cluck out a flute.
A good short reed call is worth every penny. It was hard at first for me to make the switch, I just couldn't get the short reed to sound like a goose. I almost gave up trying, but I kept at it. I would keep it in my truck and just blow on it everywhere I went (mainly because my wife wouldn't let me do it in the house
). It was like somebody turned a lightswitch on one day. It sounded awful then all of a sudden it sounded like a goose, just took awhile to get the right sound. I won't call myself the worlds best caller, but its a heck of a lot better then Iwas with a flute.
Scott