I replaced mine as they were knackered.
I could have gone for standard sized upgraded stuff, but as I am running 17s Ithought the larger disks would look better. The main benefit is the stopping power, which should always be the highest priority.
I am not upgrading the backs though, I am going for standard stuff.
I will also be fitting braided hoses as my ones have splits in the outer rubber cover. When I fitted these to my old 5 Turbo I did notice the difference over the standard ones.
James