I have had easton tracers on my arrows for the last season.

I found that the first set had issues in below freezing temps, returned for replacements.

Last season I took 2 shots. The first was a kill shot, the tail end of the arrow broke off (vanes and knock) and never found it, so no advantage in having a lighted knock in that case.

The second shot deflected off a limb, clean miss. When I retrieved the arrow, I discovered that the battery broke off of the light, the knock was destroyed and did not light.

I plan to use them again this year, but so far they have not helped or performed as expected.