The stands are just to get them to the right height, but they're pretty IMHO.
The feet I added to prevent damage to the hardware floor, and yes to help isolate the speakers from vibrations in the floor but far more to limit the amount of bass travelling from the speakers through the floor (i.e. don't offend the downstairs neighbours by avoiding turning the floor into a large bass drum where possible).
Two things:
The stands are just to get them to the right height, but they're pretty IMHO.
The feet I added to prevent damage to the hardware floor, and yes to help isolate the speakers from vibrations in the floor but far more to limit the amount of bass travelling from the speakers through the floor (i.e. don't offend the downstairs neighbours by avoiding turning the floor into a large bass drum where possible).