Was the same registration cost for me. I drove a 2013 Chevy Tahoe before (which I traded in) and my insurance premium only went up about about $20 a month, I have USAA. Can't answer the tax credits as I bought used, and based on a discussion with my CPA on how it would have gone, you probably ought to talk to a tax professional about how it would roll out in your situation. Taxes are complicated :-/
What type of issues have you had?
In no particular order; door handle replacements, power window malfunctions, USB outlet replacement, replace faulty (and brand new) windshield wiper, rear camera malfunction, rear jump seat replacement, cabin heater malfunction, charge port replacement, 12 volt battery malfunction, roof rack cover fell off, loose suspension causing strange noise, battery sent to be refurbished after inspection from a contactor upgrade (at 29,000 miles on the car), and drive unit replacement (at 35,000 miles on the car).
I feel like I'm forgetting a few things. Certain things were fixed at the same time.
Did they take care of you well at least?
Very well taken care of, especially the first 6 months while the service center could do same/next day appointments. Recently they've been booked a little further out, the number of Teslas here has exploded faster than they can hire service people, and they only have 2 bays at their location.
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I should note that, the car never failed to drive for me and I never got stuck anywhere. The battery and drive unit things were proactively done by service without me having an idea there was an issue. If anything, do your optional annual inspection for that reason alone; spot issues before they happen.