I tested these heads a while back. I will say they fly great, and are some of the sharpest broadheads out of the pack I have ever seen!
They are not as durable as many other cut on contact style heads I have tested, and to be honest I was very disapointed in their penitration in 3/4" plywood. I could not get completed penitration with these heads, while other heads like the bear razorhead, and razor lite, G5-B52, as well as every fixed replaceable blade head( except the sattilte mags) busted right through. The tips and head can bend under realy heavy impact, although they did survive the steel drum test, but again did not penitrate as well as the better heads. In foam their penitration was as good as any head I have tested.
I personaly would go with a bear razor head lite, or G5-B52's, or maybe a magnus head( I have not tested any of the magnus heads yet, but I will soon) over the steel force heads. That said I have heard more good reports from the field, than bad ones. Most who use them like them.

TAKE YOUR KIDS HUNTING AND YOU WON'T BE HUNTING FOR YOUR KIDS