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The genuine Monza 18's weigh 11kg and my OZ Alleggerita 18's weigh 8kg - The difference in feedback is significant. Out of curiosity I wonder what both Bentley and Maybach 20's weigh.
Anyone considering 19's or 20's is surely primarily doing so for looks. Nothing wrong with that at all but it's going to effect the feedback and handling on the GTI platform.
RR, my 19" VMR 701's weight 11kg each which is the same as a stock Monza, so not lighter but not heavier either. Defo went for looks though in my choice of alternative wheels.