I fish spey and dee flies, tube flies, prawn flies, you name it. Does it really matter to the fish, not in my opinion. Does it matter to me?? You bet, i only fish flies i have confindence in, if i don't have confindence in a fly then i'm not going to fish it. The speys and dees, to me, are all about the beauty and tradition. I love to fish them and love to tie them even more. I get bored at the bench if i'm constantly tying stuff that isn't a challenge. Yeah they can get expensive, but it's worth it to me.
Oh well, to each his own.