Great thread! I switched to theses this season. I really like the way the fly. So far out to 90 yards they are spot on with my sight tape for my field points. I have shot grim reapers in the past but could not get them to fly right this year with my new bow. I like the new shock collar as compared to the old rubber band, the blades on the rages always seemed to come loose. So far the Hyperdermic's have passed all my torture tests and have not come open accidentally yet. Hopefully after next weekend I can comment on how they work on an animal.