You guys are kiding , punchcutters were the worst mecanical ever produced .
I'm going to have to respectfully disagree with you. The design of the Punchcutter was a very inefficient one for blade deployment by today's standards. However, I still took several deer with them, one in particular with my old Golden Eagle Pro Turbo that delivered a whopping 44 ft. lbs. of KE and I still got a pass through. The blades were very sharp on the Punchcutters and they were made of high quality aluminum and werevery well put together.
The worst broadheads I have had experience with were the Puckett's Bloodtrailers. They had the same concept as Punchcutters, but with very loose tolerances and poor quality materials. It felt like the blades were going to fall out of them they were so bad.
To answer the original question, my experience with mechanicals is that they kill deer good.