I switched to IW SB 100s last year, have shot 4 deer with them so far.
All complete pass-throughs, with excellent blood at the shot site. The first three didn’t seem to know they were hit. I’d shoot, they’d react like they got bit by something, run off 15-20 yards, and tip over. Good blood from shot to where they died.
Last one was a buck I shot a few weeks ago. I misjudged how hard he was quartering to and ended up with a single lung/liver/guts shot. He ran 20 yards, then started walking. Thought he was going to tip over like the others, but he bedded down about 50 yards away. Watched him for 45 minutes silently telling him to put his head down and die. Instead he got up and walked off. Walking away I saw the exit side and through the binos I could see some intestine plugging up the exit wound, I’m assuming the vanes pulled it out on the exit. Found a drop of blood where I last saw him before he walked off the ridge but lost it at that point.
I don’t blame the broadhead at all, they seem to work really well so far. I think you can give yourself an advantage with a really sharp fixed blade, but no broadhead is going to be magic and provide a guarantee.