Mine has been trouble free and have enjoyed driving it. Some others have had some issues with their cars so I can tell you about reliability of them considering the low number of cars in general. I would get it over 750. Now if you can wait a year, M5 would be a better choice. In general though, after owning BMW's for 20 years, I can tell you the build quality has declined noticeably. If you get the X, don't forget the comfort seats.