TTX technology inside, immediate response, wide adjustment range with external adjusters.Completely separated compression and rebound function.CNC machined upper fork legs, create tuned flex.Improved internal valving.Lighter inner and outer tubes.25mm internal pistons. Approximately 500 grams lighter than FG 570.New improved settings, easier to adjust.New top cap design.Radial mount caliper brackets, new spring guides and interchangeable caliper brackets.New manual with more detailed set up information. Used in AMA, WSBK, BSB, JSBK and other major national events. These are the very same forks the best riders in the world are currently using. I ended up picking up the older prxls. Don't get me wrong I would have loved to get a ttx but I couldn't find a used one. I am doing all this on a budget while trying financially footing the majority of the bills getting my wife through school. As for the forks, they are a deal for sure as I cant really even get new cartridges for the price I found them. I am used to riding around on stock suspension which isnt even sprung for my fat ass. No matter what these will be a major improvement for me which my skill level is likely never to top. I am going to get them refreshed and sprung for my weight. I appreciate your input on the subject though as your racing experience far outweighs mine.