the semi automatic fly reels should not be compared to the old, heavy automatic fly reels of 30 or 40 years ago. semi auto reels have no spring inside them; so there is nothing to wind. semi auto reels have adjustable drags. depending on the model semi automatic fly reels hold considerable backing and spools can be changed. some are made from aluminum blocks and can be used for salt water. I think the reason more people don't use them in America is that they are pricey. they are popular in europe especially competitions.