Thanks for all this. I may have been just incredibly lucky.
I bought my S100D in Sep 2018. It was an “inventory” car with 8k miles on it, manufactured in late Feb 2018, so was one for the last S cars manufactured with MCU1 (I didn’t know squat about MCUs at time of purchase). The car had a a number of problems, likely because it had been driven very hard in test drives. Many months after purchase, Tesla replaced the front half-shafts and the air suspension, both of which had been updated since its manufacture and I got the newer (stronger) parts, no charge. Had a mobile service visit to replace the passenger side mirror which folded too far, touching the trim, and they replaced the trim at the same time. No charge. I had purchased FSD, so I was given the option of paying another $2.5k to update to MCU2 when they updated to AP3, and decided to go for it, because I was worried about lifetime of MCU1, and wanted the cool new features enabled by MCU2. I believe they recently lowered the MCU2 upgrade cost to $1k or so which is a bit of an annoyance but not huge.
I liked the car and service experience well enough, and my wife came around after being suspicious of the new high tech toy, and she decided she wanted a model 3 (she got sick of driving the Jeep). So we purchased an M3 AWD LR in Sep 2019, and it got delivered in about 3 weeks. It had some minor issues which were fixed easily and quickly. My wife noticed that her M3 always had a motor whine, mostly at 20-40mph, but said oh its fine, but I decided to ask them if they could fix it. They test drove it and volunteered to replace the sound sealer under the battery in the back seat. I didn’t think was the problem because it sounded to me like the sound was from the front, but ok its on their dime and it is a huge job the battery has to be completely pulled out. It took them at least a week, then they called and said we test drove it and it did not make enough of an improvement. We are gonna replace both of your front drive units, again free. Holy crap, another few days but then we picked it up and it is pretty much silent through all speeds. Wow.
So I have no clue how much of the difference between my experiences and yours can be attributed to timing, location of service centers, or just luck of the draw. I am actually considering trading in my S100D for a CT tri-motor long range, because that would give me a big bump to 500 mile range and latest technology, and the price I got quoted for my $100 reservation is quite “reasonable” for such a crazy high-tech beast. If I pull the trigger, I am hoping that the 2021 CT won’t have reliability/serviceability issues like your 2013 S.