I've only got the Clear Beer systems, just recently started using them. But I know that in researching my options, I heard of people having trouble with other systems where the tube is just loosely hooked to the float, as it can float up on its own, become "unsubmerged," and just draw gas. The Clear Beer is designed so that the the intake is positively held an inch or two below the surface. I figured it was worth the extra money to take no chances.