All i can say is i'm glad i never bought new springs instead , perhaps i'm just lucky but for me the combination of very old springs and spacers works far better than i could possibly have guessed . There's a foot square 3 inch deep pothole down the road and i can hardly feel it at 30mph but while testing the set up and driving over speed bumps at 30mph i get the impression nothing would cause the suspension to bottom out . And thats with only the front spacers in , the rear spacers should arrive by the end of the week but for the time being comparing the front suspension to the back is like comparing a Mercedes S Class to a pram .
PS i didn't buy them with any ideas about improving anything i just wanted to stop 285/75's rubbing .