[ slightly edited version of a reply i made a week ago on the CR article]:
I have a 2017 Model X that I bought new. The EV part is great, its everything else that sucks. Since I've had it, I've taken it for service for the following:
o Arrived w/o Tow pkg (Tesla "forgot" it, was installed via service center appt)
o falcon wing doors improperly adjusted, leading to wind noise and water intrusion
o Loud wind noise and fogging passenger side windows: Due to improperly installed "triangle" window on passenger door
o Worn half shafts caused shudder under acceleration, replaced at ~20k miles
o fogging drivers side A pillar camera after rain, leading to "navigate on autopilot unavailable"
o Drove in "low" mode to preserve half shafts, caused excessive tire wear. Wore inner rear tires down to a puncture around 30k miles. Replaced tires and had car re-aligned to run in "low" mode.
o Half shafts replaced again at 38k miles
o Upper control arms shot around 39k miles, car just out of warranty, and Tesla initially wanted $1k to fix, but eventually fixed for free after I complained.
All in all, I'm thinking to get a different car since I need a car that works. I don't want a non-Tesla EV since the charging options for non-Tesla EVs suck. I'm currently looking at PHEVs. Ironically, I'll probably unload the Tesla for another EV only if/when Tesla opens superchargers up to other EVs.
How much of a loss would you take if you sold your Model X right now? They are not very available new, so I assume you would not loose too much money. Mine has actually gained a bit in value over the last 18 months or so..