I am looking at affordable ball machines. The frontrunners are the Tennis Tutor, Lobster Elite, and Silent Partner. The Silent Partner has an advertised top speed of 95mph, the Tutor is 85mph, and the Lobster 80mph. I hit the ball hard and of coarse it tends to come back hard. Speed is important to me, but I can't say exactly how hard I hit - or a top pro hits in terms of mph. Does anyone have any experience with these machines at top speed and heavy spin? I probably wouldn't consider the Silent Partner except for that top speed.