It all depends on what the bottom is like. If it is flat then using backleads will pin the line to the bottom, also, when using three or more rods a captured angry carp will not knit one, pearl one with your other lines . If the bottom of the lake is all over the place with holes, bumps, bars, ditches etc then using a backlead is pointless as the line will cut through the water from where the back lead is sitting. Make sure that you use a backlead that is heavier than your swinger/hanger, otherwise when setting your bobbin it will just pull the back lead up from the bottom :mad: . I often use them, but do wonder sometimes if they have cost me fish :confused: . About £3.50 for three they are expensive, especially if you are like me and think you have attached it to the line only to find it falling to the bottom of the lake with no line through it :mad: . I use the Korda intelligent ones, havent had one lost yet . Have a good lead around of the lake you are fishing, then decide if you need to backlead. Hope this helps.