I have been using muzzies for 6 years and am very impressed with their capablity. I have used a rtractable 2 times the first time I lost the animal the second time it only penatrated half way up the shaft. I really don't see the benifit like all these big hunting guys onT.V. are saying so which is better retractables or fixed broadheads.Oh yeah the retractable was a reaper.