Techno-Stuff where techno stuff is not required. Use a little white artificial fur as tracer at the end and you can see your arrow just fine. A white nock alone doesn't help. If the nock takes off with the animal and your arrow you are out $.05 instead of $8 for just the nock. For target shooting at dusk or in low light conditions, they are fun, but you can tape the little floating lights to the end of your arrow for that. But a lot of time lighted nocks don't help much in finding arrows either, especially under leaves.
For finding animals you shot at, the string tracker is the better choice if you hunt in very dense or difficult terrain like swamps where you can not pick up blood trails because of water.
And if you ever have the buck of a lifetime walking under your stand, you kill it and then want to enter it into Pope and Young or Comptons, that won't work as electronic devices on arrows are not accepted. Keep it simple.