Manual for the ball machine. Its very diverse in functionality, but not as self-explanatory as one would desire (me at least), so a manual may help.
https://eleven-vr.fandom.com/wiki/Ball_Machine
From that manual, also this description of the AI. The AI is an ongoing project and step by step gets added additional capabilities and options, its physics as well. But already now it is very convincing, for the occasional player who does not play on organsied club sport level it is hard to see, if at all, where the physics suite currently still is lacking. So, while it still gets improved in regular intervals, it already is very, very good.
The AI plays relatively flat shots generally, with only a little topspin in most rallies. The current AI will not hit topspin against backspin, either similarly hitting backspin in return or, if the shot is very high, a smash. The AI has been known to hit extreme backspin shots against very powerful drives and loops, though this is not intended behaviour. The AI as currently implemented struggles with high lobs and serves also, even on reduce mistakes mode.
An unusual note about the current AI is that there is currently no difference between its forehand and backhand shots. It is as if it is an ambidextrous player which smoothly swaps hands and always hits a forehand.