JUGS has been in the business of making great baseball/softball training equipment for over 45 years. They're on the forefront of most people's minds when they are perusing the pitching machine market. John Paulson, the founder, was first interested in helping his sons practice - fast forward to today, and over 200,000 baseball and softball teams us JUGS machines.
Went cheap with a 1 wheel machine a few years ago. While it served us well my boy quickly outgrew it. The hack attack jr does so much more and is built like a tank. I'm sure this will be the last machine we buy.