There's a popular misconception that flat leads sit on silt. This does not happen, any lead finds the easiest path through the water so instead of fluttering down to the lake bed, a nose-heavy flat lead like this will plummet down side on and nose first, making it less effective in the silt than say a Swivel Pear lead.
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The backleads can be set to stay on the main line without dropping off or they can be set so that the backlead breaks apart when snagged in weed. The super-slick plastic attachment ensures that the backlead will glide easily down the line, dramatically decreasing the chance of movement at the rig end. Backleads are most effective over even, flat bottoms and are an excellent way of preventing a hooked fish from picking up your other lines.