To be honest, I bought this because I’m intrigued with spinners because they are so soothing. I’m already somewhat familiar with the spinner gyro effect that is both soothing and beneficial. So not only is this just fun to use but it’s also very beneficial for working your hands, wrists and forearms. I got to admit, for me, it’s a little difficult to get the hang of the wrist movement and I wish I could keep it going for longer, but that is just me. At first, I thought it wasn’t doing anything, but after playing with it, I definitely feel like my fingers got a workout. I don’t know if that is due to me inadvertently squeezing or if it’s due to holding this since it does have a bit of weight to it. I’m giving it the benefit of the doubt and saying it’s the product working! I read a review that it is noisy and don’t know if that person had a defective one or not because mine is quiet as a mouse. I thought I was only getting the black one, but it actually included a red and blue band in the box so - bonus!