I'm still kind of unsure on them. They penetrate like no other, but if I'd have shot that buck just before dark instead of first thing in the morning, trailing would have sucked! He only made it about 90 yards. I could see him from where the arrow was lying, but there wasn't much of a blood trail. He pretty much bled out internally.
I've used Snuffers and Woodsman before and gotten MASSIVE blood trails. I was shooting a little heavier bows, though, so I thought I needed to go with a two blade. The Deltas are BIG, but they don't quite leave the gaping exit hole of a three blade. They zip through so fast it is amazing though. Unfortunately, I zipped one through a turkey this spring, and it managed to get airborne. After hours of searching, even with the aid of a dog, my cousin and I didn't find him, so I bought some big old 160 grain Snuffers for next turkey season. I may even use them for deer if I take my Orion hunting.