Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Good tool but serious problem with contact piont

The device works well, but the contact point on this unit is made out of hard plastic. Each contact makes a very loud ping. My daughter and I literally wear hearing protection when working with it. This is annoying, but my main concern is that thin-walled high performance bats could be damaged by this unit. Indeed there is a warning label on the stick that reads "use only with practice bat." Because different bats swing differently I would prefer a unit that could be used with the game day bat.