it's a better marketing device than a product of value in my eyes.....I understand that it does work, but I've been successful attaining accuracy without one on many rifles....

Years ago when things like that was installed on shotguns they was called dial-a-duck.....today they should be called dial-a-deer

If you like the looks of it on a rifle have at it...if not pass on it.

I truly don't think it adds value to the gun.