I have to disagree with the bad blood trail.....
I have been bowhunting for 25 years and every head I ever used at one time or another has left a "bad blood trail". There is just so much going on here that I would need more than one experience to say its the heads fault and not some other factor.
In my experiences with this head I have killed a huge buck with the glue on 125 serrated head, total distance deer traveled after hit was 15 yards, The I killed a doe with the head that went 10 yards. Then I took a poor shot and just took out one lung on a button buck, and it took my 8 hours to find him and he went about a mile. I'd say the head is a good one but it can only do its job if we do ours and take close responsible shots.