Hoyt, i must disagree about the toughness of sonics. I actually think they are one of the toughest heads out there. They are all steel, and have thick blades. The 3 deer I taken with them, all were complete pass thrus, after hitting some sort of bone and sticking a foot or so, into the rocky earth beind them. The 200lb 8 point, in my pic, in my last post, sliced through both scpulas like warm butter, not one head bent or lost a blade. The trick is to tighten the rear locking ring down with plyers as hard as you can ,I even use a little treadlocker.I do agree w/ you, they are very underrated ,but also very under priced.