I swapped to Simmons broad heads recently after 35+ years of using Bear, Zwickey and Magnus heads.... I have no plans on ever going back.
The Simmons fly great, are super strong, and they just drain animals of that bubbly red stuff faster than anything I have ever tried. I am still amazed at the size of the wound holes they open up.
I hit a buck extremely high this year and from a severe quartering angle, the broad head entered just in front of his ham and just under the backbone.... it traveled all the way to front of his sternum and lodged there.... no exit hole and a very high entry hole. I figured it was going to be a long, hard tracking job. Wrong, i Found blood immediately at the impact site and walked the trail to where he collapsed only 80 yards away. This buck died running and yet the blood trail was easy to follow. Never had such luck with the flat smaller two blades.
There is just something about the concave shape of the Simmons heads.