I have the full conversion on my car and it makes a massive difference, not immediatley as they have to bed in but the pedal is now extremely progressive, basically if you want to stop quicker, press harder. The car remains composed when braking from high speeds and IMO is well worth the money plus has the benefits of being 'insurance friendly' with the OEM look and BMW branding.
Aesthetically they are superb, I have lost count how many times cars passing me on the motorway have slowed down and taken a glance at the brakes whilst in motion.
I'm picking up the second car tomorrow a 130i 3 door which will have the upgrade as soon as I have the money, I've decided to have the Performance exhaust first so I can appreciate the sound of the straight 6.
His - Audi S3 Sportback & Honda S2000.
Hers - BMW 320D Sport, New Shape. eta 16/06.
"Fast Cars are Safer..."