I got this for my 14 year old son who has ADHD and behavior issues while in school, and after a meeting with his teachers and assistant principal, and came to the agreement that he needs an item like this to occupy his hands during class time. I got this, and he says that it's great, it moves smoothly, and every cube separates from one another. The sounds also helped him concentrate, and they seem to soothe him. He opened it and didn't put it down! I'm happy with the purchase and will definitely recommend it to others. Great Job.