They are an excellent broadhead. I've used them for a few years now. Tough, good penetration and the four blades make a nice hole in them.
In Africa I had complete passthroughs on Kudu, Gemsbok, Zebra and Impala and on the Wildebeest it hit the opposite shoulder and still penetrated the hide on the opposite side. The only animal that went more than 50 yards or so was the Gemsbok and that was my fault, it was the first animal I shot and I had not aimed forward enough for the anatomy of African game. What would have been a perfect shot on a whitetail or elk hit the back part of lungs and liver. Thankfully the trackers in Africa are amazing and we were able to follow his trail and recover him.