Anyone here used canadian express wilt guard before?

If so is it worth getting a bottle...my local hydro shop only does 1 lite bottles for 25quid but i dont need anywhere near that amount and dont wana waste that much money on it. One of my girls has got root rot but she was always gona be a small stunted plant anyway and i dont know wether its worth trying to recover her or just toss her out...shes wilting heavily and duno if il even get anything off her now the state shes in...

Take that as a no then...