I used the bear razor head for years and never had any problem with a slow bow with heavy arrows.Then I heard about these expandables and thought they where just a great idea a bunch of years ago.Started useing various brands thats when my trouble started from blades not opening to one opening to bands breaking in flight hitting a small twig and opening to alot less penatration then I thought I should have.Maybe I picked the wrong ones I am sure there are good ones out there .I just feel to bad when I can t find one of gods creatures that I wounded cause spring broke or a band broke and the arrow flew a foot to the right and hit it in the guts.So now that I am shooting a fast bow with light arrow I think I will stick to one of the fixed blades mentioned on this forum.Just my thoughts thanks everyone for your input it has my transtion from finger shooting to release shooting with a fast bow alot easier and cheaper David