2011 x6 use VFD and frequnce motors,both taiwan made.
quaility very stable,we have QC inspection before we loading,and after machien arrive,syil dealer also will open it and re-check it again..
so,it is not so bad as your said.
mach3 series machine some time hardly to compare the industry controller series.like S,or V.
it is depend on customer computer,software,cable connectors.