I finally decided to buy the Utopia Backrest for my 06, and it is a quality product to say the least. It adjusts backwards, forwards, and up and down. It has one engineering flaw in my humble opinion---the tube presses so hard into the passenger pillion that it actually distorts its shape. They provide a protective shield to keep it from tearing the seat, but it still distorts the shape.
The comfort level is very good. My stock seat is still uncomfortable, but I am looking at a pad by Butt Buffer and Comfort Max. Anyone have either of those? Anyway, its another step towards more comfort on the longer rides. Jim:)