The scariest, sharpest, broadhead that I have seen is a Magnus Stinger. I use the 125gr Magnus Stinger 4 blade heads.
Sharp? You wonder how these things stay in the package! They are so sharp, I mean, OMG....these things will slice you open justlooking at them!
Stingers are the only broadhead where I use a tool to take them off or put them on. I don't want to touch the blades at all! You gotta be that careful with them!