I have a 2018 AWD M3 and a 2017 100D MX. not your exact comparison basis, but a few thoughts on what it feels to go from a 3 to a pre-Raven X.
I wouldn’t even think about an older X for a split second if these cars were stuck with MCU1. It would literally take 5 minutes for navigation to reroute, on top of myriads of other issues. So if you find one still on MCU1, budget for the MCU2 upgrade.
Sentry mode, even with the MCU2 upgrade, doesn’t have all the same features. Like, you won’t have the remote camera from the app option.
You are correct, 1 pedal driving did not retrofit back to the pre-Ravens. But regen is good, and using the brake is just the last few mph. I really don’t notice the difference.
My falcon wing doors have had 100% reliability. My auto presenting drivers door has had a couple of issues in the first year. None after that.
Peak supercharging speed is less on the legacy X, and I believe 75D and 90D may have even slower speeds than my 100D. For me it’s not a big deal - extends a typical stop by about 5-10 min when I’m charging to 60% or 70% to get to the next SC. I do feel the time difference if I’m needing to go to 90% or above.
The degraded range on either of the possibilities you mentioned is going to put you down in the low 200’s rated miles. And of course actual miles are usually less, sometimes much less. I do have to say, though, that my Model X now sometimes gets actual miles that equal the rated miles on long trips during the summer. Best I can hope for on my model 3 is about 90% (same roads, similar conditions). So I don’t notice any range difference between my current 275 rated miles on the MX vs my current 295 rated miles on the M3.
Yellowing screen was fixed for me with Tesla’s UV treatment and it hasn’t come back. Also, if on satellite view, it isn’t very noticeable anyway.
Other random thoughts:
- As far as I know, all versions of the MX can have a shudder when doing a hard acceleration (like when merging into a highway.) That has been fixed twice for me, and the last time, about 10k-15k miles ago, is still good so far.
- The MX feels infinitely clunkier than the M3, and does not have as modern of a feel inside. The layout of the console and cupholders is much worse on the MX. I go through spurts of being bothered by the dinosaur feeling. But ultimately I do prefer the 2 screens, I find physical air vents helpful, and if I had to pick only one Tesla to keep it would be the MX.
- When shopping for older MX’s, be aware that a lot of features used to be alacarte, and what got bundled as the Premium Upgrade Package changed over time. If there is something important to you, verify the car has it. For example, my car has the PUP but does not have the winter package nor the premium stereo. Not all MX’s have the auto-presenting front door.