The jury is out for us on the benefit of knee savers. My DD is 8. She started using them a few months after she began catching consistently. However, as we have been able to develop a better stance, I have definitely questioned the value of them. She is now using her "up/runners on" stance for every pitch. My DD is not the most agile of catchers. She works hard and is determined, but she's not a fast and flashy athlete. She has to work hard as a result to get similar results to those who might be more gifted in that way. Given this, the knee savers, which are the small youth size, added a lot of bulk to her legs. Her movement with the knee savers on appears much more clumsy and uncoordinated. I'm not sure of the practical effect of the lower movement speed, but just looking at her, she appears much more agile without the bulk on her legs. We've been on a break from them for a couple of months and she has not asked for them back. Ultimately, I will let her decide.