I went with KW's only because I previously had variable dampers and Mini confirmed to me that the JCW Pro suspension is not available for my car and if I had them fitted (by third party) the warranty on the suspension would have been void as they were not designed for a car spec'ed with variable dampers.
If I had the passive std. suspension I would have chosen the JCW Pro suspension as to not have any warranty issues.
It's possible to get good deals on the JCW Pro suspension if you shop around.
As for the spacers... I suspect the only parts that could possibly be void are the connecting parts to the spacers and possibly wheel bearings perhaps. Maybe check with your dealer to be 100% sure I guess if you are worried.
If I had the passive std. suspension I would have chosen the JCW Pro suspension as to not have any warranty issues.
It's possible to get good deals on the JCW Pro suspension if you shop around.
As for the spacers... I suspect the only parts that could possibly be void are the connecting parts to the spacers and possibly wheel bearings perhaps. Maybe check with your dealer to be 100% sure I guess if you are worried.