I am the southern zone director for BHA(Bowhunters of Alabama) and we used the Delta Targets for our state championships for the long distance course and they were very different than the Mckenzie targets that we are used to shooting. The kill zones are very forgiving for left and right shots but not for misjudged yardage up and down. If you shot just out of the ten ring you were a "5". I hope that they will keep the scoring and kill zones the same as they have always been for the IBO shoots. The kill zones were not as durable as the Mckenzies either, but the cost of replacment kill zones was much cheaper then the mckenzie.