I plan on doing this, not just for the weight reduction, but for the cargo carrying capacity increase (I doubt I will be able to fit the
separate wheels and tires in the car, to get them to the shop for mounting and balancing, without doing this!).
I will put down some light weight closed cell foam/'acoustic studio foam', covered by a thick moving blanket, to try and quell the 'booming' at least a little bit.
My take on the weight reduction is that it
means more, or at least becomes more crucial when one is still on the factory turbo with just a tune and minor mods, although yes, it DOES help everyone, even if you cannot "notice" the benefit.
(It DOES also help 'save' the drive train {final drive, gear box, half shafts, CV joints, clutch} from a bit more stress, especially those running BIG power setups.)