one small problem ive found (would be possible with the lumenok too) is if you hit it kinda hard like dropping them on the floor (while on arrow) they light up. just be carefull of it so you dont put them away turned on.

one other positive is that even if the nock itself fell off or got busted or something the light inside still blinks red so should still find them pretty easy.

also for tunning a lighted nock is awsome can see the flight perfectly