Amazing fit and finish, therapeutic, great exercise for my fingers, great conversation starter. I bought this because I had a dream of a black sphere that opened up into an energy bubble that brought me great joy. True story. I searched for black sphere puzzle and found this. Took me about an hour the first time. Now it takes me about five minutes. It actually feels like a work out for my fingers. So rewarding every time he goes back together, It truly does bring me great joy. I try to do it once a day almost like a meditation. I find it quite relaxing and heartily endorse this product!