We used them to simulate fast pitching and to get a lot of swings in a short amount of time. Some loved it and some hated it. I have found that the guys that hit well hit live and pitching machine. The ones who struggled against fast pitching struggled against both. We did not use it exclusively but did it mixed in with live pitching. We had no one but our ace who threw fast and did not want to use him so we used the machine. I'm not a fan of coming in closer and throwing live fast because I think that messes with your timing more than the machine. All of us as coaches like our new toys when we get them. I loved the pitching machine but I also know coaches who hate them.