I used them for one hunt and pulled them out. Nothing against the knock, it was more where I was hunting and how.
I personally have an arrow nocked as I spot and stalk, many guys on here don't. My area is super thick and animal engagements happy quickly prior to the rut. So I keep it nocked only when in area I know holds elk. The round stem that sits in the arrow shaft is decent, but where it connects to the electrical part is a weak link. I bent one and didnt know it til ready to shoot. Seems my arrow got hooked on a branch and bent the nock at its weak spot.
I love the idea of them, and still use them in certain scenarios. My FOC is extremely high so the extra 18 grains isn't a big deal for me.
I believe the ones I was using are like 24 Grains, which is 3 times the weight of a normal nock.
I will be using them again this year in certain areas and with more caution and awareness
If you film they really help you review the shot.