My son hit .515 as an 8 year old last year. This year, he moved up a division and has struggled at around .250, even though he has a fairly nice swing. Using this device for two weeks, he suddenly can't hit anything. I pitched him hardballs today and he swung over the top of every one of the first 60! The problem with this device is that the ball doesn't drop like a pitched ball, so it actually trains them to swing higher than normal. I'll be putting this away for the season and trying to recover my son's swing and confidence. Don't get me wrong, the kids love it. The entire team lines up before every game and begs you to throw fastballs with it. It's great for use around the house - just tie it to a tree and you can take swings that you couldn't otherwise. Beware if you intend to use this for much more than casual practice and don't let it replace live pitching. Fun-factor is a 5, but as far as a training device, I have to question its value.