This will be our 3rd Tesla. We've had great experiences with our S P85 (delivered Jan 2013) and S 100D (delivered Mar 2017), and expect Tesla will do the same with our new X.
Though if there is any major issue, we will not accept delivery of the car and insist they send us a replacement. What isn't clear is the status of the funds they will have collected prior to delivery - it appears they'll likely keep our money while we wait for them to get us another car.
Don't expect that to happen though - and we're hoping the X will be here by early next week and we'll be able to take it on our family vacation next week, when the extra 2 seats (compared to our two Model S cars) will be very helpful...