I have been using mechanical broadheads ever since I started hunting as I was told they fly better. harvested a buck 3 years ago 75yards straight pass broke a rib with one of the blades (blade broken too) and through the heart. I was sold on these considering how tough it was to straight pass through a rib from that range. shooting an 09 pse stinger maxed out 70#. last season shot a buck at 15 yards and was good easy shot right behind the shoulder. only to find my arrow full of blood, blades didn't open... next day i tracked him for hours with lots of blood and spots where he bedded and had pools. sadly the blood trail got thinner until i was on my hand and knees trying to find a spec of blood. I figure I got lungs but was basically shot with a field point.. never found the deer and had to go home that day.
debating whether to switch to fixed blades or just another brand. shooting 125g NAP spitfires.