Several other Intermediate players and I in the St Louis area are starting to convert over from the normally used Franklin X-40 to Selkirks Pro S1. They do seem to be reactive during play and don't crack, so far. The only thing that detracts from the S1 is the way the color appears to fade after it is used on regular court surfaces for a while. The fading affects its ability to be seen, especially for Senior players.
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