Opinions wanted on wheel spacers

[NJ Oliva II]

I'm considering H&R's 15mm hub-centric wheel spacers.  I'll fit them to my
'90 V8 Quattro equipped with the factory alloy wheels and 225/60-15 Dunlops.

The spacers are 15mm thick and will widen the overall track-width 30mm, of
course.  But I am curious if the "safer, better handling" claim is legit, or
a sales gimmick.  I'm not even sure if 15mm per side will be cosmetically
noticeable (I like the wider looking stance).  They'll cost $190 for a set
of four.

Any wheel spacer thoughts or experiences from you all?  Thanks for having me
on the list (just joined).

NJ
'90 V8Q