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I saw my first Model 3 on the road yesterday. It was red.
My first reaction is that they're going to sell a ton of those. It will surpass the Model S in annual sales as soon as the production is there to support that. That said, it's not a "wow" car, nor is it designed to be. It's basically designed to compete with the Audi A4 and BMW 3 series, and that's what it looks like it does. I'm sure it's a blast to drive.
Never driven the 3, but I have driven the X and S and they're both insane. On ludicrous mode, the S is the fastest thing I've ever been in or on. The X even on standard mode is faster than hell and will scare you if you're not prepared for what happens when you push the pedal hard.