Never understood the paranoia about wheel spacers for every day road use, whereas wheel changes with offsets and/or increased width that effectively put the outside tyre edge in the same position seem to be accepted with little mention of the down-sides.
Yes those who track their cars will notice a difference but then suspension geometry/changes & tyres will also effect the driving feel.
And as for the safety aspect, given spacers (and wider wheels) are widely used in all forms of motorsport and the quality products they have proved to be safe in that extreme use.
But that said, the 350 got its reputation as one of the best driving cars 'out of the box' but like many I resorted to using spacers on the 370 simply for the looks and found they made precious litle difference to the feel of the car. Changing tyres (to firstly Vreds and then MPSS) made by far the biggest differences....and improvement to the driving pleasure