Just imagine this: You are calling in a bull elk. You call him into 50 yards. You dial in your one pin sight to 50 and then draw back to full draw. Then, suddenly he comes in to 30 yards. What do you do now? You would have to let your draw down, adjust your pin, draw back again, and hope that while doing all of this he won't spook and run for it! There are just way to many what if's and unknowns for me to want to buy a one pin sight. Keep it simple and buy a nice 5 pin sight from spot hogg and you wont be sorry!