I've been looking at switching to a new flyline and a friend reccomended GPX by Scientific Anglers. I did some reasearch and this is what S A says about GPX...

"The best all purpose floating fly line; designed to be one-half line weight heavier than marked."

Why make it a little heavier? I spent over $200 for a fast fly rod, why would I want to bog it down with heavier line?

I thought maybe they think people will step down 1 wt with the line to help with longer cast but then you suffer when you put on a heavy bass bug.

Any thoughts????