I'll try it shortly. I am lucky enough to have the dynablaster dongle and super tennis champs, I need to check my boxed version, I think is 4 player. You can get a 4 player adapter for the amiga.
Serving is still an issue, your player can move either side and serve in the one box. The player still moves out ridiculously wide too. The wind box seems to be unstable now too like it's constantly moving whilst playing.