I liked the Hagon Nitros, but feel the Progressive 444s are a little better.
The automatic damping adjustment and the hand adjustable spring rate of the 444s sealed the deal for me.
I just finished a 4,000 mile trip on new Progressive fork springs. At hard twisty riding, I feel they are a great improvement in reducing nose dive and reducing the amount of trail braking necessary. A special designed front fork cartridge replacement would likely be the best; but as far as I know, no one has developed a kit for the Rocket as yet.