About a month ago Tesla announced that the US Bank Lease would include a Happiness Guarantee. Elon posted a new blog post mostly about the incentives that Tesla is getting from Nevada for the Gigafactory. But in it he said the following: This implies that the Happiness Guarantee essentially applies to buyers. Given the way Tesla has treated me with my own trade of my September 2014 S85 that I'm replacing with a S85D, I'm not surprised by this. They've done a lot to build long term trust with me.