just got a couple illuminocks. man they are cool. i got them so i can follow arrow travel easier on video when i go elk hunting this fall. i have also been using bulldog knock collars. they are really the ticket for group shooting....but the illuminocks dont work well with them.
just an fyi on that.....lol
but for anyone who groupshoots with their carbon arrows....i highly recomend the bulldog collars. they work very nicely.