I first had the Centramatics installed on my '05 Goldwing when I replaced the E3 with an Avon (not so sure that was a great decision). One year later (and one year ago) I traded up to a '12 and had the dealer put them on my new bike. Now, 11 months later, I have 10k on the original tires and they are just starting to cup. I'm not sure how much of the credit is due the Centramatics and what should be credited to the Bridgstones.
I will say this, as soon as I installed them on the '05 I felt a noticeable difference in the smoothness of the ride. My 2012 has been nothing but smooth, up until about 9700 miles on the front tire when it just started to cup. I am convinced this is one of the best investments I have made for the bike.