XSF Balls are widely available and comes branded as Yinhe, Gambler, Nexy, Kingnik and so on. I have played with 2 or 3 of the variants and they all play very similar since they come from the same factory. Bounce & Speed is very comparable to the old celluloid ball, you just have to adjust your techniques and strokes to adjust to the bigger & heavier ball. Ball has only one drawback, if you miss-hit the ball with the side of your racket(bare wood) with heavy force(such as power looping). Then the ball will crack very easily, otherwise this seamless poly ball is more durable than the seamed poly balls such as the DHS 40+ and Butterfly 40+ balls. For the price, availability, playability the XSF seamless ball is the way to go.