I put Dinan springs on mine last weekend. I chose Dinan cuz i live on a dirt road and i thought ACS would be too much drop.
I have adaptive damping and ARS - no issues. In fact, the handling all-around is so much better. I can live with it in normal mode now ( I came out of an S5, and hated the stock 550 ride - I had to always bump up to "sport", then it was ok ).
As fror drop, it may not have fully settled, but it appears to have a bit more droop in the rear. Overall very happy, but will be monitoring how it settles.
I have no comparison to ACS.