tradit, I have the brand name Tracer nocks on four of my arrows now. I have only used them in practice and have not used them hunting.
I originally e-mailed the place but ended up talking to the owner on the phone. I purchased one hunter nock and after trying it bought a three pack for my hunting arrows.
There is little impact difference with the Tracer nock and my standard set up. Part of the reason may be that Im on the heavy end with full lenght shafts and 125 grn heads. The nocks are a small percentage of the total package.
Im sure that if someone as above did a tight controlled test they' d see a difference.
Most of my Whitetail harvest have been under 25 yards and I have been bow hunting for since 1969. So if Im keeping my arrows on a 2" circle during site set up at 20 and 30 yards, the weight of the nock isn' t going to effect my shooting.
Now I will be using them for Elk hunting in ID this Sept. Before I go I will practice with them from 0 to 50 yards. My point being that it' s all going to depend on what range you shoot at normally as to how much difference it will make in your sighting set up.
Since the light is initiated by a magnet, you can remove the magnet from your riser and practice all you want with the units in place without effecting battery life.
And if you' re real creative you could insert or match the weight of the nock and practice with matched arrows.
I like the lighting effect. In the last minutes of legal shooting hours in heavy cover it should make it easier to follow the arrow in flight, see the exact point of impact and recover the arrow after passing through which almost all of my hit do on Whitetails and Bear.