I use them , whether you hunt with them or not, you can't argue the fact that they really help in bareshaft tuning as you can see the nock all the way to the target and get a great tune on your bow by using these things.
It is illegal to hunt with them here in Colorado but I use them on out of state hunts. The way I look at it, it in no way helps me or gives me an advantage in hitting the animal, only in seeing where the arrow hit, and how best to follow up the hit animal.
It does however, makes me laugh when some people start soapboxing about stuff like this, and then in another thread, you hear them bragging about their new bow with foam core limbs and carbon backings!
Now don't get me wrong, I am in NO way bashing the new technology that is foam cores and carbon backs or even carbon arrows (I happen to like all of these). It just seems pretty funny to me when people will accept these things, and not something like a lighted nock.
To each his own....