A couple last things before I pull the trigger on buying this thing: 1. If for some reason it turns out I don't use the machine as much as anticipated, I need the money, etc. how is the resale on the Tennis Tutor Plus? If you bring it home and use it a few times can you resell it for a few hundred under what you paid? 2. Anyone have a major objection to buying a demo model? It's not that big of a price difference so I was going to just get the new one but if I get the demo model I'll feel justified in getting an extra function. Thanks for all the help!