My Tesla Model 3. The car is great but the ownership experience has been abhorrent. Tesla is unresponsive to calls and emails and trying to get a hold of anything for service or support is close to impossible. I leased my Model 3 and have about two years left on it...as it stands now, Tesla has done nothing to keep my business. I'm planning on going back to something German come time to turn it in unless Tesla makes some drastic changes.
I'll just toss in my 2 cents after having currently a Model X and a '18 Benz GLS550. Previous had an '07 Benz GL450 and '18 AMG GT Roadster. The dealer experience from Benz over the last decade plus has not been the shining point of the vehicles. They shmooze and talk the talk leading up to signing the paperwork. They get paid to close the deal. The after delivery of the car experience has been a lackluster at best. They will come get my cars for maintenance appointments and give me a loaner, and then they keep my car for a LONG time, drive it to the movies, drive it home, go pick the kids up from school, not completing service and having to take it back multiple times.
This is across all 3 of them. So the false expectation of a hundred thousand dollar car giving some level of extra service is what it is, a false expectation. The year over year service cost and frustrations when those cars would go in for routine service or warranty work is pretty bad.
So far the Model X has gone to the service center twice. One time because I asked them to check something out the 2nd for a repair when someone ran in to me. On the body repair appointment, Tesla practically replaced the entire front of the car in less than a week. Communication throughout the process to keep me up to date after each step.
With Mercedes I had to contact my so-called servicer advisor multiple times and had him directly lie to me twice, I requested a different advisor, same experience in a different package.
I'm not 100% set on what we will get when the GLS550 goes away but it won't be another Mercedes Benz product. Just my 13 years of experience and 3 vehicles with that company for what it's worth.