The speed of the 100D with the new Drive Unit (DU00) got me hooked and resulted in purchasing a new 100D. The initial inventory car I was going to buy showed it had the DU00, but was a very early June build. This made me nervous about whether it really did have the DU00 drive unit and no one at Tesla could verify it did indeed have it. They did have a slightly older (an even earlier June build) 100D that they were using for test drives (the original one I test drove was sold). So my plan was to test drive that one, and if I couldn't tell a difference between the two, then I'd buy the early June build car. Now, I have no quantitative data to prove this, and it could be a placebo effect, but in my "many years of Motorsports and racing" opinion, the older 100D didn't accelerate as hard, especially from 30-40 mph. This caused me to go with a slightly more expensive September build 100D that guarantees the DU00. Of course, "purchasing" and actually having possession of the vehicle are two very different things, as every Tesla owner knows. Should be here in 2 week...