Depends on who did the rebuilding and where. Every reman I have read about that had problems seemed to have been rebuilt in Mexico. There may actually be some quality rebuilds from there but.....
Ask who did the rebuilding and then check them out as much as possible online. It is so hard to make a buck in today's market that retailers are being forced into using suspect suppliers just to compete.
I have read about big name electronic component supply houses getting caught out with batches of look-alike Chinese made junk. (Pun intended.) It cost them mega $$$$ to put right and their good name was ruined.

__________________
Sent via Telegraph Wires using my Morse Key.
2015 X5 xDrive35i MSport
2013 X5 xDrive35i