Amazon calculates a product's star ratings based on a machine learned model instead of a raw data average. The model takes into account factors including the age of a rating, whether the ratings are from verified purchasers and factors that establish reviewer trustworthiness.
The 2×2 cube is very very smooth and easy to move. For beginners it will be easy to learn.Pyramid cube is also very very smooth and easy for learning to beginners so overall it is very very good combo set. No damage.