Mate, its definitely a good training tool, but don't get your hopes up. I think someone like Graham Gooch advocates its use. On the surface its a good buy, but be warned. I took care of mine and it only lasted 3 months. One of the fingers broke off mid throw
We have just been using those jugs dimple balls they are heaps lighter easier to throw more accurately and I'd assume they'd put less strain on the slinger thing. Anyways was just thinking out allowed carry on.