My first go with the Ulmers was early in antelope season, I shot a very nice buck and the broad head broke one rib nearly vertical on entry and exited breaking two ribs horizontally on the way out! I pulled the arrow out of the dirt and it still spun true, the blade edges were rolled slightly from hammering bone and dirt but what was impressive was that both blades were still intact (which is not common on the popular competitor) Entrance and exit wounds were both impressive and awesome blood trail for the whole 70 yds he ran.
I have never been sold on expandables but the accuracy and performance of these have convinced me enough that they are in my quiver for my coveted mountain goat tag!