Funny story...My son is a small 11u player. He casts but just a little and not every swing, very nice swing but slightly out from his body. Bought this to correct that slight issue, and I can see this working to fix it over time but the funny part is when he takes a fast swing and casts the Velcro breaks and the strap slaps him right in his face!!! I fell off the bucket laughing the first time because that is instant feedback If I ever seen it!!

He is not a fan yet but I did see a slight improvement after my amusement and had him do slow dry swings for about 10 min before we did tee work without the device. We will continue with the dry swing in slower motion before I subject him to the next beatdown.

2nd day update....after having my son read some.of these reviews and him seeing some detailed success stories he was willing to put in work and gave it another chance... so today before his team practice I had him do 50 dry swings slowly, he finished with about 15 dry fast swings and guess what.....He swung without triggering the feedback. He was excited.
We went to practice and he hit so well the coach asked me if I had him do private batting lesson with a hitting coach. His teammates were making comments about how hard and far he was hitting the ball every swing. He has never put together that type of show so I am gonna give it a 5th star and highly recommend this to anyone from 60lbs and up.

3mo update....Well my son leads his team in BA, SLG, OBP, and contact %. He plays 11u travelball on a fairly good team and is the 2nd to smallest player out there. He is also playing up at 12u for some tournaments and is outhitting the bigger, older kids. And I give most of the credit to this product. It has fine tuned his swing to make all aspects better and more consistant. He uses this product everyday by himself in the cage off a tee and almost never triggers the device anymore. He will do Tee, soft toss and front toss with it on just to challenge himself.

I can see how a kid that is rough with mechanics may quit before giving it a chance but try to convince them to stick it out because it will help if you allow enough time to build that muscle memory.

I bought this for my son who is ten. He plays competitive baseball. We bought this to help fine-tune his swing and improve his contact on the ball. He just started using SwingGrail. It takes time to get used to it. My son uses it almost every day for about twenty minutes. I think it's still too early to tell but at practice yesterday, he was making very good contact on the ball. I also noticed his bat speed has improved which makes it very helpful when facing fast throwing pitchers.

The media could not be loaded. What I like is that its pretty simple to put together. If you have a tee in your backyard or set up at your house you can get going within moments. It does take sometime to get use to it once you have it set up.

Never really thought a gimmicky contraption would be so useful, but it has helped my son a ton. He was swinging all arms for the longest time and hitting a lot of weak grounders and pop ups, but this trainer has his arms in the right place on contact, or it pops loose. Helpful and worth the price.

I'm 34, and I have had trouble getting my muscle memory back for my swing after a shoulder injury. I used the swing rail to really reinvent my swing. It's helped a ton. It also works great for my 5 and 6 year old boys.