1. Tennis Tutor Plus: After a very thorough review of things, I think I'm probably going to go with the tennis tutor plus. Judging from many of the threads on this site and what I've heard, I'd say it is very well respected as a good machine. (if anyone wants to reinforce this choice or voice a major objection, please do so!) My main question now is whether or not to get the 2 line feature. On one hand I think it may be nice and doesn't cost that much more but on the other hand I don't want to spend an unnecessary $200. The only reason I would want it would be because I would want to get a good workout sprint back and forth across the court to hit shots. I can see where it would be useful if you have 2 people hitting but to be honest I think that will be a rare situation for me and if it does happen, we'll just pick sides of take turns. The other thing I need to know if how fast the oscillation is and is it related to firing rate--in other words, the machine sweeps right to left and then back left to right. If you set it for say, 2 seconds, how many does it throw in one sweep? Also, if you set it for 10 seconds, does it still throw the same number of balls (ie-the oscillation slows) or does it still oscillate the same speed and just shoot every 10 seconds (ie-less balls per left to right sweep). Perhaps the best way to ask this is to give you the bottom line--I want to run and get a good workout while hitting tennis balls--if I set it to oscillate and make it rapid fire, I was thinking that each ball may not be that much further than the last one so I wouldn't run that much whereas with the 2 line function I could set it for 2 seconds and literally have to sprint side to side, which would be great. Any help is appreciated! 2. Batting Practice: I also play competitive baseball and take batting practice with tennis balls. I was thinking of using the tennis tutor to double as a pitching machine. Has anyone tried this? I hear it is plenty accurate but if the balls are slightly different pressures does it make it impossible to throw a strike? (see question below, which may partially answer this) 3. Practice Balls: Lastly, balls for the tennis tutor. I just saw a review that said to not use normal balls because it will drive you crazy. What balls do you guys use? Also, if you do have balls of varying pressures, how drastic is the difference? If one ball is shot at 85 MPH to the baseline and the next ball is pretty flat, does that mean it might just make it to the service line or does is roll out of the machine without ever making it over the net? I'm just trying to get an idea of how much the varying pressures matter and what balls you guys use in them. I imagine a little bit of pressure variation may be good as it would also vary the length of shots. I have a batting tutor (from the same company) and I know that the balls you use can make a difference, although the machine is generally fairly forgiving of different densities. I'd love some tennis tutor facts. Thanks so much for all the advice and wisdom--I really appreciate it!