I would have rated higher if not for the fact that these balls are NOT seamless. You can obviously see seams on each ball. In fact on some of the them, you can feel the minor ripples across the seam. I am only an amateur player. I am comparing these Gogo balls to the other balls I own. When compared to Joola 2 stars Magic Balls, you can find occasional unevenness of seams on these Gogo balls but not on the Joola Magic Balls. When compared to Stiga 3 stars USATT approved balls, you can tell these Gogo balls are not likely true 3 stars. I would say the Joola 2 stars Magic Balls are better quality in evenness and shape.However, I must say. There Gogo balls works VERY well with my iPong v300 robot. These Gogo balls have a very matted textured surface. It is actually powdery and leave dusty marks on the table! But the extra surface texture make them easily gripped by the robot and get shot out by the iPong robot faster than the Joola 2 stars Magic Ball (the surface of the Magic balls are polished and smooth). The extra surface texture of these Gogo balls also enhance any effect of spins you put on them!Conclusion: Good practice ball to put into robots.
Rating: [3 of 5 Stars!]