This machine works perfect. I believe it is way better than wheel type machines due to safety, portability and usability. Single wheel machines do not throw pop fly's and are unsafe if you try. The 3 grand kids and I use this almost daily. The ZS740 is very accurate with throwing strikes. You just cant ask for anything better for a portable baseball practice machine. Super easy to set up and use. I normally don't do reviews but this machine deserves the 5 star rating in every way.