They do make tuning easier. Never tried the grizzly stick but have been tempted. I understand that are not American made. So I haven't purchased them.
The Arrow Dynamics are American made and cost less. They haven't been consistent lately. I would guess they are hard to make. Straightness can be an issue.
If you cull them and turn all the weak sides out you might find the best hunting accuracy you ever had. They do have some suprising flight and forgiveness properties. I go back and forth. I really like the precision of three rivers trad parallel shafts. But when I'm not shooting well I get out those AD tapered shafts and everything is good.
We need Easton to make a precision tapered carbon.