I am just curious what your telltale signs are that you need to replace your system. Is it when the lace tears? Or the hair is too dry it's unmanageable? Or when the system starts shedding? I'm curious when most of you decide to throw it out and stick on a new one. I may have a follow up question depending on the answers. I searched the forum and maybe I wasn't looking for the right thing, but most conversations about this just say "it's getting old and needs to be replaced." I was just looking more specifically what issue is the leading cause of needing to be replaced. Thanks!