I shot a few with 2 inch Rages. Out of four deer off the top of my head run distance varied from 6 feet to just over 200 yards. One did not exit. All produced a lot of blood. I used them on crossbow arrows that went about 500 grains with the head. They were accurate, and shot to the same point of impact as field points. I used a different than supplied O ring, and seated the "barb" on the blade into the O ring. That kept the blades from opening until it hit Bambi. They're as good as anything IMO and like any large cut head should be used with a heavy arrow behind them unless you have the power of a crossbow to work with, in which case you caan make do with a moderate weight arrow. Speed is not what drives the arrow through, it's the weight behind the head.
