Birthing Comb?

Nikki👼🏻👧🏻👦🏼👼🏻👼🏻👼🏻👼🏻👼🏻

Has anyone tried using a birthing comb during labor? I figured for $4.99, it didn’t hurt to try out. However, I’m not even really understanding how to use it because some articles say push it into fingers and then others say a certain point in the palm….so I’m lost. Is it worth it?