I have some on my whitetail xp's and they are bad a$$.Iuse dark fletching so the pro for me is to actually watch the trajectory of my arrow.I have only shot them out to 40 yards and they are very visible out to that distance,can't wait to see one disaprear into a deer's chestThe only negative i see to them isturning them off.You have to pull and wiggle them up,not twist them.If you twist them you can break the little wire that activates them.What i did was buy four and site in with them and leave then on until the batteries died.That way i can shoot all summer with them and just before sept.15th i install brand new onesNot the cheapest way to go but then who said archery was cheap???