I have personally never used them but my brother has had experience with them. He guided several archery bison hunts over the past few years and he was impressed. He has seen bison shot with about every broadhead sold and said the vortex, by far, was the best. Absolutely devastating as he put it. Huge holes and very short tracking. He said nothing else even compared, fixed, mechanical, or two blade. He also said 125 gr gobbler getters don' t work very well but that is another story.