Terry, if you have had bad experineces with the 328 loaner it would show why there is such polarized respones on the X3.
Where some folks swear there are no problems and others like us swear there is.
5 out of the 6 328i loaners that I drove where very smooth.
The one was as bad as the standard X3 complaints.
Has the ZF GA6 been in use longer then the GM6?