If you want to know the difference between Beiter and Shibuya plunger its ease of use for setup and tuning the Beiter is the way to go. The plastic of the Beiter plunger is more durable than the plastic Shibuya plunger, Shibuya get round this buy supplying a metal plunger this makes a noise as the arrow is drawn back some people don't like that and some archers have noticed that a metal plunger tip can affect arrow speed although I have not had time to check that although I do know that my bow tune does change slightly when I swapped them around.I'm beginning to think Beiter is the way to go. Thanks to all for the input, I'm always looking for something new to try and the magnetic sounds good in theory but we'll wait to see better implementation I guess. I think I'll start another thread asking Shibuya or Beiter? What are the benefits that merit a $110 plunger? Again thanks for the help.