I used them last year, had mixed results with em. Sometimes they wouldn't light up, sometimes they would. Also slowed down the flight of my arrow quite a bit, had to resight my setup after using them. Just FYI.
Have the same issues with the Lumenocks
the nockturnals are about $5-$10 cheaper so I may try them
as far as slowing them down & resiting
I am no expert but had the same issue w/ all the lighted nocks which I think has to do with the extra wieght in the tail end of the arrow
but thanks for the info