"littlefeather" said this: "in days of old everyone shy'd away from the shoulder. We've got to remember that the performance difference in the old wood bows and wood arrows wasn't near what todays glass bows, carbon arrows, FOC, and incredible broadheads."
What are you classifying as old....son 8^). I've had 1956 bows that will shoot with todays models. I have a 1966 that will shoot with any 2009 bow. Todays bows have only one thing over the old models for performance.....fastflight strings.
We shouldn't be shooting at shoulders, but I fear the use of some magic, single-bevel, will make shoulder aimers come out of the closet. Single-bevels, no matter how much they cost, will not be a solution for bad shooting, whether it is accidental or on purpose. A bad hit is a bad hit, and usually results in a bad outcome. I wouldn't spend money on a broadhead that "may" help on a bad hit.
I'm quite sure the single-bevel heads are great heads; however, they are not the only heads, and they are not the only heads that will plow through a shoulder and kill deer. It would be best to use what you think will do the best job for your, and let everyone else do the same. Good accurate shooting, and knowing when to release an arrow, is a better bet than what the head is made of or how it's designed.