first off the sling works awesome right out of the box! the instructions say give a huge amount of space around you when slinging. i was surprised how fast the simple learning curve was for the release. here's where the lesson was learned. i got lucky right off the bat hitting my targets with the practice ball,to the point of cockiness! hehehe. i took it to work where we have a big field behind the shop and after a dozen throws decided to try a small stone for the first time. lucky again! hit the exact can i called out so i grabbed a stone the size of a golf ball and loaded up. this time the change was so drastic my timing was off and the stone went high. and boy did it go high! lol it went so far it landed through the side window of a 2019 toyota parked fifty yards back!!! well, $260 for parts and an hour of my life and lesson learned! im practicing at the beach now ,slinging into the open gulf of america! highly recommend this product! its a lot of fun connecting with such old technology. happy slinging people,