I took delivery of mine back in June. While there will be a lot of variation in people having issues, both major and minor, to those having none, you should be prepared if you buy a Model X.
I have had one minor issue so far. That is that the doors swing a little toward the rear of the car when opening and closing. For me this caused the FWD window glass to clip the rear quarter window trim. Not a huge issue for me, and the fixed it at my request, but others have had much worse problems, including the door not wanting to close because it senses the path is obstructed. My fix was pretty easy... they moved the rear quarter windows back a hair to give the doors more clearance. Adjusting the doors themselves is a real hassle, often making things worse. They are over-engineered and all the moving parts have the potential to be problematic.
They do turn heads though and has a lot of advantages for easy access to the second (or third) row.
If you are OK with the fact that you MAY get one with some sort of issue, and are comfortable with having to possibly get it fixed post delivery, or flat out decline delivery (probably rare), then you may be very happy with a Model X. While my experience would not translate to everyone, I adore mine.
So while I would rather issue caution to anyone purchasing one, as long as you are prepared for the possibility and OK with the corrective actions, then I say do it. If you are one that is used to buying a lot of luxury cars, that are far less complicated (as far as doors go) and used to everything being 100% at delivery, and also know you would be upset at paying 100K for a car not perfect at delivery, then I would discourage you from making the purchase.
Hope all these comments can help you make a more informed decision!
Good Luck to you and hope you are happy with hour decision either way. Let me know if I can be of further help. I did a lot of research on Tesla's before pulling the trigger, so I was prepared for what I may have to go through.