going on my 3rd year with them,
not even close....to the flex of the old invaders, maybe if you mount 2 invaders on top of eachother thats the stiffness of them.  ^Also stiffer then the anthems by a good amount, ^ if were doing a line comparison id say stiffer then the blends, FSB (last years), and afterbangs, maybe close to the cronics (havent played with them in a while)
there stiff skis, by no means 2bi4's, still supper supper poppy and fun, most bombproof skis ive ever been on, they do break in well though mine have loosened up after a while
personally the only thing that would make them better is a slightly softer flex patten, that apparently that is what they did this year