one big fish and at the EXACT distance you set the hook on it , that will be for sure as FAR as it will cast the next time you cast !
they tend to dig in the spool as stated when some ...thing/or person bears down on them hard , and the main factor involved is a bit difficult to totally cure.
all the kids and my wife use them though and yes at times they malfunction, but for sure they beat most of the alternatives , short of a can pole maybe ....