Im using Naps Killzones but the head that raised some eyebrows for 2013 is the Ulmer Edge. i like that if it works its way out of a animal its tearing stuff up on the way out. but usually wait a year before buying to get some better reviews before i spend the coin on a new product.
Have your killzone s ever failed you? If not why change. I'm changing from thunderheads to kill zones this year because my thunderheads didn't fly straight.