I have had good luck with the Sonics. Two cow elk with no problems. Took out ribs on both and the heads showed no damage. Only problem was there was not much of a blood trail, although both animals went just 60 yards. Been looking for a better head though and I have the new Terminal locks on order. I'll let you know after the elk hunt how they do. Or with any luck at all, after the early archery deer hunt.
Eddie