Friend had to have the Eo ring of death. I suggested AP, for a bunch of good reasons.

Another friend was a dealer, so I was able to get him one. Few months later we went to the range. His Eo batteries were already dead.

Having or requiring a kill switch is a deal-breaker. Unless it's going on a range toy.

And I can't get them bright enough for all conditions. Ring tends to wash out in bright.