I've tried an awful lot of broad heads and to be frank, Rage is the only brand I flat refuse to try anymore. I started with the o-ring style, then the hypodermic, and lastly the chisel tip extremes. Each three pack had one head that wouldn't fly well and all of them ad a slight whistle. Not a big deal. I shot 6 of 9 heads & all killed efficiently. The reason I won't try them anymore is because I have also shot numerous other types from numerous other brands & not had any of the issues I experienced with Rage. The exception is Dead Meats. They flew fine but were so loud I wouldn't hunt with them. Much louder than any of the Rage. The absolute truest flying and quietest heads I've shot are Raptor Tricks. I just hate that it wastes an o-ring to even test shoot them, which I do with every head before hunting with it. I like NAP and Grim Reaper mechanical heads because they fly straight & quiet without using an o-ring. I also like Wasp Jackhammers. They have an o-ring but it doesn't break, just rolls back the shaft & can be reused. And there are still way more heads that I have yet to try. So far anything Rage and Dead Meat are crossed off my list. Just too many awesome heads to waste money on them again.