I have never owned anything but a Keller and I love it but have heard nothing but good things about savage predator4 pemdulum. Here is a pic of my set up with my keller on an HHA slider so I set it at 30 yrds for treestand use when the pin swings free and when I lock the pin down, I can shoot from the ground , 20 yrds to 70 yrds.