I am shooting them this year. Only shot one doe, she whirled and stuck her way back, she only went 60 steps, so I can't tell you yet about penetration through rib bones. They fly well, I have had to go back and tighten a couple screws that hold the blades on to keep them from flopping. Seem to be well made and I can't wait to put one in the lungs, hopefully soon.
I will tell you one thing, the blades are sharpened on both sides, if you get some be dang sure they are buried deep in your quiver. I have cut myself about three times this year reaching for stuff on the back seat and brushed my hand over the quiver with a head not fully recessed inside.