After much research, most of it from these boards, I ordered a SAM SP-4 and 72 SAM pressureless balls last Monday from MasterSports. They seem like nice folks to deal with. It arrived via FedEx ground today. I charged it up while I went to the Monday tennis clinic. Unfortunately I am traveling out of town tomorrow, so I can not try it out until Wednesday. On first impression, it is bigger than I expected. In all the pictures they never show it against a person or a car to give you some kind of persepective. So far all I know is that it runs as I fired it up in the house without any balls loaded. My community club has 2 little-used new unlighted courts. So we will see how much fun this thing will be.