I've been thinking about getting a tennis ball machine. I do not think my court has a power source so I'll need a battery powered one. Also, I would like a machine that oscillates and can really give me a good workout if I just go out by myself and hit for an hour or two. Portability is also important as I will have to take it out to the court with me every time I use it. I have been looking most closely at the Tennis Tutor Plus. I had a batting tutor from the same company growing up and always liked it. What do you guys think about getting the Plus instead of the tennis tutor? Does the spin function add much more to your practice session? I was thinking that if you are spending $1000, you might as well go ahead and spend an extra $200 or so and have all the functions. I'm looking more at the tennis tutor than the Prolite because I want the increase in speed from 60 to 85. I was thinking that would make this machine more versatile as I improve and also, I still play baseball and often take batting practice with tennis balls so I was planning to put it on a table in the batting cage and have it double as a pitching machine (has anyone tried this?) and the extra MPH will help there. Any thoughts are greatly appreciated. Are there other machines that fit my needs that people think are superior to the Tennis Tutor? Thanks so much for all the help!