My 5 year old ADHD boy came home from school one day asking for a spinner toy. Having no idea what he was talking about I quickly "googled" it and found what he was talking about. They looked really cool and thought it would be perfect for him. I bought one for each of my 5 boys as it looked like something they could all use.
They love them! I can't speak to how they help kids and adults with issues around stress and ADHD as I haven't seen any difference but this is certainly a toy worth buying.