CMCST900: efficiency: 13 in cutting swath allows for efficiency CMCST900: easy to use: telescoping pole feature makes turning to edge easy CMCST900: automatic line advance: feeds 0.065 in line automatically with no bumping required CMCBL700: powerful performance: powerful blower performance up to 340 cfm and 90 mph CMCBL700: more runtime or power: dual-speed control for more power or runtime