I self-installed a module from eBay mid December on a December 2023 new MYLR. Has continued working with the new 2024 software releases so far. It was NOT about saving $100, it was about driving 3.5 hours each direction to the closest Tesla service center vs. spending about 30 minutes to install it myself. We had a great mobile ranger but he moved on to a better job with Tesla energy. Given how hard it is to hire people, we've had no new ranger for at least the last year. Since then, it's a bear to get any Tesla work done due to that 7 hour round trip commute.