Hey mrbb I've use aluminock for 5 or more yrs. Its the only way i can see where the arrow goes. My eyes are not what they use to be. The only issue I've had with them is sometimes the light goes out when they pass threw the animanl. They disconnect as they go threw. I have tried the easton lighted knocks and they worked the same without the light going out with a pass threw. But the small magnet that glues to the bow has always fell off at unknown times. A if the magnet isn't there the light does not come on. Great products though.