You'll feel a big difference going from ANY older-style prop to a new CNC prop, so long as it's a good match for your drivetrain. I think the old 4-blades were known for having better hole shot than the equivalent 3-blade, but now the difference is less between the two, so long as you're comparing CNC to CNC. It's like, different brands of snow tires perform differently on snow, but they're ALL better than any all-season tire.