I had my trade re-evaluated after approximately 1000 miles and the value dropped from 14k to 13.5k, seems really odd to me that they give trade values good for 30 days when you are getting ready to place an order, but lead time when I ordered was 5-9 weeks, so the trade offer never could have been valid. This is normal for Tesla but a consumer who has dealt with other brands for their entire car buying experience where the deal is the deal when you make the deal. Tesla changes it in their favor at the last minute pissing off the customer who was under the impression they had agreed on a total package. Leaves a bad taste in the buyers mouth. I love my Model Y but everyone who asks me about it hears alot more about how Tesla sucks to do business with and their delivery quality, albeit improving, still is pretty sad for vehicles at this price point.
Mine only went down $500 so I was angry but it was still the best I could get so I didn't walk away.