I've got the FF stage II box and love it (70E). I liked it even better when I got caster up to 5-7 degrees. The car had fairly high cornering limits from the get go from springs/swaybar and decent tires. With the caster dialed in and -.75 deg camber limits increased but more noticably, it was just fun to corner. It feels "right". FF was great to deal with and helped set up my suspension plan and trouble shoot a little along the way.

Next refinement? Probably measure and figure out how to correct bumpsteer if needed. I may play with pump pressure also per the MA article.