I just received an email yesterday offering the opportunity to participate in the Tesla battery swap program (at Harris Ranch). I haven't called the number yet to set an appointment to go in, but it seems that none of the folks I know that have Teslas received the invite (perhaps I was invited since I've done the LA to SF drive 3 or 4 times over the past year?). My question is what are the pros and cons of this program? For example, my car currently has 17K in miles on the car and it seems there has been no battery degrading over the 9 months of owning the car. Here are my questions: 1) Is the battery replaced with a new battery or a recycled battery? 2) If the battery is recycled from another car, could I get stuck with an older battery that perhaps is somewhat degraded in terms of distance (ie my battery has only 17K on it, what if I get a battery that has 100K on it?) 3) Is there the chance that I could get a battery with a longer range? For example, I've got the 85 battery. If Tesla starts to offer a 100 battery (or whatever), would I be eligible for it? Any other thoughts or questions that I should ask?