I had serious cold feet at your stage. Got mine mid December. I've had twinges of regret but overall love it. It's far more money than I've ever spent on a car, so I'm a little sensitive to things. This forum amplifies all the problems, but so do all car forums. My current regrets: wish I went for leather or white instead of cloth. It catches my pants every time I exit, and is rough. I would save the money on paint and get black; it looks great. Interior is black on black, and I don't have the fancy inside lighting. It is too dark. Needs either light seats or lighting. Wish I knew that up front.
It does have a few quirks. The doors front and side are meh more than amazing, in my opinion. The wipers suck, a huge peeve of mine with salty roads. A few controls are too many clicks away on the dash. Even the tow receiver is overengineered and complicated.
I do love many things about it. My 90 is crazy fast, smooth, quiet. Swallows my whole family and the ski bags.
The autopilot thing is like a bonus, that may or may not come. I personally think not purchasing now, not paying for it with taxes and registration, and maybe adding it later when/if it is amazing and good to go. I would delete that option if doing over.
Oh, and I had my actual car for 5 days, then the back window blew out. Possible defect. It's been in the SC ever since. I'd be furious if I wasn't given a loaner immediately. It's been 3 weeks now, and they keep calling and saying things like sorry, the replacement glass also had a defect, we're sending for another one...