Ordered a bundle for high school team I coach. Expected to only use it for a few pitchers, but we have found applications for all position players too. Have an outfielder that pushes when he throws and this is helping him really let it go with authority. Catcher that cuts the ball when throwing to 2B. Using this he is now throwing straight balls on throw downs. All it takes is a couple throws a day with this thing and there is noticeable difference. I have a feeling this will be a secret weapon when the next case of the yips rears its ugly head.
Update: one of ours split down the middle. It is kind of cool to see the inner workings. I had tried to make my own by epoxying two hockey pucks together, but it never worked, and now I see why. The clean fuego has a metal ball in the middle that effectively mimics the actual center of mass in a real baseball. Customer service immediately emailed me back when I sent them a pic, fully replaced it, and threw in a shirt. I know these things seem expensive, but they seem to be a very valuable investment if you coach or are serious about your own development as a player.