I love my Shotkam. Its helped with seeing where my misses are and especially seeing how the barrel stopped swinging because I looked at the bead to measure the lead. That's a cardinal rule no no in clay shooting! Even on rabbit targets, I thought I was missing behind but the Shotkam frame by frame playback showed I was actually in front. I haven't tried a Garman but the Shotkam has definately improved my scores.